Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r213-smll-167840356600172.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
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=====================================================================
Generated by BenchKit 2-5348
Executing tool lolaxred
Input is HealthRecord-PT-06, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r213-smll-167840356600172
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 484K
-rw-r--r-- 1 mcc users 7.8K Feb 26 18:11 CTLCardinality.txt
-rw-r--r-- 1 mcc users 89K Feb 26 18:11 CTLCardinality.xml
-rw-r--r-- 1 mcc users 4.4K Feb 26 18:06 CTLFireability.txt
-rw-r--r-- 1 mcc users 38K Feb 26 18:06 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:13 LTLCardinality.txt
-rw-r--r-- 1 mcc users 27K Feb 25 16:13 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Feb 25 16:13 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:13 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 26 18:12 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 114K Feb 26 18:12 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 6.6K Feb 26 18:11 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 54K Feb 26 18:11 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 16:13 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:13 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 3 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 67K Mar 5 18:22 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

FORMULA_NAME QuasiLiveness

=== Now, execution of the tool begins

BK_START 1678610697563

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=lolaxred
BK_EXAMINATION=QuasiLiveness
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=HealthRecord-PT-06
Applying reductions before tool lola
Invoking reducer
Running Version 202303021504
[2023-03-12 08:45:02] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -timeout, 180, -rebuildPNML]
[2023-03-12 08:45:02] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-12 08:45:02] [INFO ] Load time of PNML (sax parser for PT used): 108 ms
[2023-03-12 08:45:02] [INFO ] Transformed 154 places.
[2023-03-12 08:45:03] [INFO ] Transformed 319 transitions.
[2023-03-12 08:45:03] [INFO ] Found NUPN structural information;
[2023-03-12 08:45:03] [INFO ] Parsed PT model containing 154 places and 319 transitions and 835 arcs in 252 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 154/154 places, 319/319 transitions.
Graph (trivial) has 262 edges and 154 vertex of which 14 / 154 are part of one of the 7 SCC in 7 ms
Free SCC test removed 7 places
Ensure Unique test removed 32 transitions
Reduce isomorphic transitions removed 32 transitions.
Performed 56 Post agglomeration using F-continuation condition.Transition count delta: 56
Deduced a syphon composed of 56 places in 1 ms
Reduce places removed 56 places and 0 transitions.
Iterating global reduction 0 with 112 rules applied. Total rules applied 113 place count 91 transition count 231
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 114 place count 91 transition count 230
Performed 27 Post agglomeration using F-continuation condition.Transition count delta: -33
Deduced a syphon composed of 27 places in 1 ms
Reduce places removed 27 places and 0 transitions.
Iterating global reduction 1 with 54 rules applied. Total rules applied 168 place count 64 transition count 263
Applied a total of 168 rules in 67 ms. Remains 64 /154 variables (removed 90) and now considering 263/319 (removed 56) transitions.
[2023-03-12 08:45:03] [INFO ] Flow matrix only has 216 transitions (discarded 47 similar events)
// Phase 1: matrix 216 rows 64 cols
[2023-03-12 08:45:03] [INFO ] Computed 18 place invariants in 20 ms
[2023-03-12 08:45:03] [INFO ] Implicit Places using invariants in 387 ms returned []
[2023-03-12 08:45:03] [INFO ] Flow matrix only has 216 transitions (discarded 47 similar events)
[2023-03-12 08:45:03] [INFO ] Invariant cache hit.
[2023-03-12 08:45:03] [INFO ] State equation strengthened by 84 read => feed constraints.
[2023-03-12 08:45:03] [INFO ] Implicit Places using invariants and state equation in 338 ms returned []
Implicit Place search using SMT with State Equation took 813 ms to find 0 implicit places.
[2023-03-12 08:45:03] [INFO ] Flow matrix only has 216 transitions (discarded 47 similar events)
[2023-03-12 08:45:03] [INFO ] Invariant cache hit.
[2023-03-12 08:45:04] [INFO ] Dead Transitions using invariants and state equation in 415 ms found 0 transitions.
Starting structural reductions in LIVENESS mode, iteration 1 : 64/154 places, 263/319 transitions.
Finished structural reductions in LIVENESS mode , in 1 iterations and 1299 ms. Remains : 64/154 places, 263/319 transitions.
Discarding 212 transitions out of 263. Remains 51
Initial state reduction rules removed 1 formulas.
Incomplete random walk after 10000 steps, including 1070 resets, run finished after 987 ms. (steps per millisecond=10 ) properties (out of 50) seen :34
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 16) seen :0
Incomplete Best-First random walk after 1001 steps, including 14 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 16) seen :0
Incomplete Best-First random walk after 1001 steps, including 15 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 16) seen :0
Incomplete Best-First random walk after 1001 steps, including 22 resets, run finished after 27 ms. (steps per millisecond=37 ) properties (out of 16) seen :0
Incomplete Best-First random walk after 1001 steps, including 5 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 16) seen :2
Incomplete Best-First random walk after 1001 steps, including 11 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 1001 steps, including 13 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 1001 steps, including 11 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 1000 steps, including 11 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 14) seen :1
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 1001 steps, including 9 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 13) seen :1
Incomplete Best-First random walk after 1001 steps, including 13 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 12) seen :0
Incomplete Best-First random walk after 1001 steps, including 11 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 12) seen :0
Running SMT prover for 12 properties.
[2023-03-12 08:45:05] [INFO ] Flow matrix only has 216 transitions (discarded 47 similar events)
[2023-03-12 08:45:05] [INFO ] Invariant cache hit.
[2023-03-12 08:45:05] [INFO ] [Real]Absence check using 10 positive place invariants in 8 ms returned sat
[2023-03-12 08:45:05] [INFO ] [Real]Absence check using 10 positive and 8 generalized place invariants in 5 ms returned sat
[2023-03-12 08:45:06] [INFO ] After 332ms SMT Verify possible using state equation in real domain returned unsat :0 sat :3 real:9
[2023-03-12 08:45:06] [INFO ] State equation strengthened by 84 read => feed constraints.
[2023-03-12 08:45:06] [INFO ] After 79ms SMT Verify possible using 84 Read/Feed constraints in real domain returned unsat :0 sat :0 real:12
[2023-03-12 08:45:06] [INFO ] After 611ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:12
[2023-03-12 08:45:06] [INFO ] [Nat]Absence check using 10 positive place invariants in 9 ms returned sat
[2023-03-12 08:45:06] [INFO ] [Nat]Absence check using 10 positive and 8 generalized place invariants in 7 ms returned sat
[2023-03-12 08:45:06] [INFO ] After 303ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :12
[2023-03-12 08:45:06] [INFO ] After 169ms SMT Verify possible using 84 Read/Feed constraints in natural domain returned unsat :0 sat :12
[2023-03-12 08:45:07] [INFO ] After 448ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :12
Attempting to minimize the solution found.
Minimization took 231 ms.
[2023-03-12 08:45:07] [INFO ] After 1144ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :12
Fused 12 Parikh solutions to 11 different solutions.
Parikh walk visited 0 properties in 8 ms.
Support contains 25 out of 64 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 64/64 places, 263/263 transitions.
Graph (complete) has 375 edges and 64 vertex of which 55 are kept as prefixes of interest. Removing 9 places using SCC suffix rule.3 ms
Discarding 9 places :
Also discarding 9 output transitions
Drop transitions removed 9 transitions
Drop transitions removed 11 transitions
Reduce isomorphic transitions removed 11 transitions.
Iterating post reduction 0 with 11 rules applied. Total rules applied 12 place count 55 transition count 243
Discarding 6 places :
Symmetric choice reduction at 1 with 6 rule applications. Total rules 18 place count 49 transition count 217
Iterating global reduction 1 with 6 rules applied. Total rules applied 24 place count 49 transition count 217
Ensure Unique test removed 19 transitions
Reduce isomorphic transitions removed 19 transitions.
Iterating post reduction 1 with 19 rules applied. Total rules applied 43 place count 49 transition count 198
Drop transitions removed 24 transitions
Redundant transition composition rules discarded 24 transitions
Iterating global reduction 2 with 24 rules applied. Total rules applied 67 place count 49 transition count 174
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 2 with 1 Pre rules applied. Total rules applied 67 place count 49 transition count 173
Deduced a syphon composed of 1 places in 0 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 2 with 2 rules applied. Total rules applied 69 place count 48 transition count 173
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 0
Deduced a syphon composed of 1 places in 1 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 2 with 2 rules applied. Total rules applied 71 place count 47 transition count 173
Partial Free-agglomeration rule applied 9 times.
Drop transitions removed 9 transitions
Iterating global reduction 2 with 9 rules applied. Total rules applied 80 place count 47 transition count 173
Applied a total of 80 rules in 98 ms. Remains 47 /64 variables (removed 17) and now considering 173/263 (removed 90) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 98 ms. Remains : 47/64 places, 173/263 transitions.
Incomplete random walk after 1000000 steps, including 108361 resets, run finished after 27645 ms. (steps per millisecond=36 ) properties (out of 12) seen :2
Incomplete Best-First random walk after 1000001 steps, including 17818 resets, run finished after 4814 ms. (steps per millisecond=207 ) properties (out of 10) seen :1
Incomplete Best-First random walk after 1000001 steps, including 17818 resets, run finished after 4599 ms. (steps per millisecond=217 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 1000001 steps, including 20583 resets, run finished after 4837 ms. (steps per millisecond=206 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 1000001 steps, including 16790 resets, run finished after 2304 ms. (steps per millisecond=434 ) properties (out of 9) seen :6
Running SMT prover for 3 properties.
[2023-03-12 08:45:51] [INFO ] Flow matrix only has 162 transitions (discarded 11 similar events)
// Phase 1: matrix 162 rows 47 cols
[2023-03-12 08:45:51] [INFO ] Computed 9 place invariants in 5 ms
[2023-03-12 08:45:51] [INFO ] [Real]Absence check using 1 positive place invariants in 1 ms returned sat
[2023-03-12 08:45:51] [INFO ] [Real]Absence check using 1 positive and 8 generalized place invariants in 6 ms returned sat
[2023-03-12 08:45:51] [INFO ] After 83ms SMT Verify possible using state equation in real domain returned unsat :0 sat :3
[2023-03-12 08:45:51] [INFO ] State equation strengthened by 74 read => feed constraints.
[2023-03-12 08:45:51] [INFO ] After 40ms SMT Verify possible using 74 Read/Feed constraints in real domain returned unsat :0 sat :0 real:3
[2023-03-12 08:45:51] [INFO ] After 190ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:3
[2023-03-12 08:45:51] [INFO ] [Nat]Absence check using 1 positive place invariants in 1 ms returned sat
[2023-03-12 08:45:51] [INFO ] [Nat]Absence check using 1 positive and 8 generalized place invariants in 4 ms returned sat
[2023-03-12 08:45:52] [INFO ] After 72ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :3
[2023-03-12 08:45:52] [INFO ] After 39ms SMT Verify possible using 74 Read/Feed constraints in natural domain returned unsat :0 sat :3
[2023-03-12 08:45:52] [INFO ] After 81ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :3
Attempting to minimize the solution found.
Minimization took 31 ms.
[2023-03-12 08:45:52] [INFO ] After 227ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :3
Fused 3 Parikh solutions to 2 different solutions.
Parikh walk visited 0 properties in 1 ms.
Support contains 12 out of 47 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 47/47 places, 173/173 transitions.
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 4 place count 43 transition count 157
Iterating global reduction 0 with 4 rules applied. Total rules applied 8 place count 43 transition count 157
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 10 place count 41 transition count 137
Iterating global reduction 0 with 2 rules applied. Total rules applied 12 place count 41 transition count 137
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 14 place count 39 transition count 131
Iterating global reduction 0 with 2 rules applied. Total rules applied 16 place count 39 transition count 131
Ensure Unique test removed 12 transitions
Reduce isomorphic transitions removed 12 transitions.
Iterating post reduction 0 with 12 rules applied. Total rules applied 28 place count 39 transition count 119
Partial Free-agglomeration rule applied 4 times.
Drop transitions removed 4 transitions
Iterating global reduction 1 with 4 rules applied. Total rules applied 32 place count 39 transition count 119
Discarding 2 places :
Symmetric choice reduction at 1 with 2 rule applications. Total rules 34 place count 37 transition count 105
Iterating global reduction 1 with 2 rules applied. Total rules applied 36 place count 37 transition count 105
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 37 place count 36 transition count 102
Iterating global reduction 1 with 1 rules applied. Total rules applied 38 place count 36 transition count 102
Ensure Unique test removed 6 transitions
Reduce isomorphic transitions removed 6 transitions.
Iterating post reduction 1 with 6 rules applied. Total rules applied 44 place count 36 transition count 96
Drop transitions removed 4 transitions
Redundant transition composition rules discarded 4 transitions
Iterating global reduction 2 with 4 rules applied. Total rules applied 48 place count 36 transition count 92
Applied a total of 48 rules in 30 ms. Remains 36 /47 variables (removed 11) and now considering 92/173 (removed 81) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 31 ms. Remains : 36/47 places, 92/173 transitions.
Incomplete random walk after 1000000 steps, including 109198 resets, run finished after 12495 ms. (steps per millisecond=80 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 1000001 steps, including 18562 resets, run finished after 2454 ms. (steps per millisecond=407 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 1000001 steps, including 18684 resets, run finished after 2552 ms. (steps per millisecond=391 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 1000001 steps, including 20639 resets, run finished after 2735 ms. (steps per millisecond=365 ) properties (out of 3) seen :0
Finished probabilistic random walk after 1135 steps, run visited all 3 properties in 32 ms. (steps per millisecond=35 )
Probabilistic random walk after 1135 steps, saw 471 distinct states, run finished after 32 ms. (steps per millisecond=35 ) properties seen :3
Able to resolve query QuasiLiveness after proving 51 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK PROBABILISTIC_WALK BESTFIRST_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 69713 ms.
ITS solved all properties within timeout

BK_STOP 1678610773407

--------------------
content from stderr:

+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination QuasiLiveness -timeout 180 -rebuildPNML

Sequence of Actions to be Executed by the VM

This is useful if one wants to reexecute the tool in the VM from the submitted image disk.

set -x
# this is for BenchKit: configuration of major elements for the test
export BK_INPUT="HealthRecord-PT-06"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="lolaxred"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"

# this is specific to your benchmark or test

export BIN_DIR="$HOME/BenchKit/bin"

# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-5348"
echo " Executing tool lolaxred"
echo " Input is HealthRecord-PT-06, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r213-smll-167840356600172"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HealthRecord-PT-06.tgz
mv HealthRecord-PT-06 execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "StateSpace" ]; then
rm -f GenericPropertiesVerdict.xml
fi
pwd
ls -lh

echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "StateSpace" ] ; then
echo "The expected result is a vector of booleans"
echo BOOL_VECTOR
else
echo "no data necessary for post analysis"
fi
echo
if [ -f "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.xml" ] ; then # for cunf (txt files deleted;-)
echo echo "here is the order used to build the result vector(from xml file)"
for x in $(grep '' QuasiLiveness.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
fi
echo
echo "=== Now, execution of the tool begins"
echo
echo -n "BK_START "
date -u +%s%3N
echo
timeout -s 9 $BK_TIME_CONFINEMENT bash -c "/home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n \"BK_STOP \" ; date -u +%s%3N"
if [ $? -eq 137 ] ; then
echo
echo "BK_TIME_CONFINEMENT_REACHED"
fi
echo
echo "--------------------"
echo "content from stderr:"
echo
cat STDERR ;