Execution Chart

Sorry, for this execution, no execution chart could be reported.

Trace from the execution

Formatting '/data/fkordon/mcc2025-input.r016-smll-174853764700247.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2025-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5832
Executing tool itstools
Input is BridgeAndVehicles-COL-V50P20N50, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r016-smll-174853764700247
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 468K
-rw-r--r-- 1 mcc users 7.3K May 29 14:47 CTLCardinality.txt
-rw-r--r-- 1 mcc users 68K May 29 14:47 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.8K May 29 14:47 CTLFireability.txt
-rw-r--r-- 1 mcc users 62K May 29 14:47 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 29 14:32 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.4K May 29 14:32 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4.7K May 29 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 31K May 29 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.0K May 29 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 20K May 29 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.3K May 29 14:47 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 77K May 29 14:47 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 10K May 29 14:47 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 71K May 29 14:47 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K May 29 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K May 29 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 29 14:32 equiv_pt
-rw-r--r-- 1 mcc users 10 May 29 14:32 instance
-rw-r--r-- 1 mcc users 5 May 29 14:32 iscolored
-rw-r--r-- 1 mcc users 44K May 29 14:32 model.pnml

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

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

The expected result is a vector of booleans
BOOL_VECTOR

echo here is the order used to build the result vector(from xml file)
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-00
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-01
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-02
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-03
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-04
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-05
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-06
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-07
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-08
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-09
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-10
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-11
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-12
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-13
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-14
FORMULA_NAME BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-15

=== Now, execution of the tool begins

BK_START 1748818712940

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=BridgeAndVehicles-COL-V50P20N50
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is COL
ReachabilityFireability COL
Running Version 202505121319
[2025-06-01 22:58:34] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2025-06-01 22:58:34] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2025-06-01 22:58:35] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2025-06-01 22:58:35] [WARNING] Using fallBack plugin, rng conformance not checked
[2025-06-01 22:58:35] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 895 ms
[2025-06-01 22:58:35] [INFO ] Imported 15 HL places and 11 HL transitions for a total of 168 PT places and 531118.0 transition bindings in 30 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 26 ms.
Reduction of identical properties reduced properties to check from 16 to 12
Working with output stream class java.io.PrintStream
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-03 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2025-06-01 22:58:36] [INFO ] Built PT skeleton of HLPN with 15 places and 11 transitions 56 arcs in 7 ms.
[2025-06-01 22:58:36] [INFO ] Skeletonized 10 HLPN properties in 0 ms.
Remains 1 properties that can be checked using skeleton over-approximation.
Reduce places removed 3 places and 0 transitions.
Computed a total of 9 stabilizing places and 6 stable transitions
Graph (complete) has 22 edges and 12 vertex of which 10 are kept as prefixes of interest. Removing 2 places using SCC suffix rule.2 ms
Ensure Unique test removed 1 transitions
Reduce redundant transitions removed 1 transitions.
RANDOM walk for 312 steps (0 resets) in 10 ms. (28 steps per ms) remains 0/1 properties
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 30 ms
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 3 ms
[2025-06-01 22:58:36] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality5279466550231013807.gal : 11 ms
[2025-06-01 22:58:36] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality5202127887566703997.prop : 0 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality5279466550231013807.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality5202127887566703997.prop' '--nowitness' '--gen-order' 'FOLLOW'

ITS runner timed out or was interrupted.
its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...328
ITS tools runner thread asked to quit. Dying gracefully.
RANDOM walk for 0 steps (0 resets) in 4 ms. (0 steps per ms) remains 0/0 properties
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 8 ms
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 2 ms
RANDOM walk for 0 steps (0 resets) in 4 ms. (0 steps per ms) remains 0/0 properties
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 2 ms
[2025-06-01 22:58:36] [INFO ] Flatten gal took : 2 ms
Finished probabilistic random walk after 0 steps, run visited all 0 properties in 0 ms. (steps per millisecond=0 )
[2025-06-01 22:58:36] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality901870822216408316.gal : 1 ms
[2025-06-01 22:58:36] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality3686659391743393992.prop : 0 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality901870822216408316.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality3686659391743393992.prop' '--nowitness' '--gen-order' 'FOLLOW'
ITS runner timed out or was interrupted.

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...327
Loading property file /tmp/ReachabilityCardinality3686659391743393992.prop.
Found states matching all0 target predicate
Will report total states built up to this point. Computation was interrupted after 3 fixpoint passes
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
petri\_inst\_inst,5,0.004605,3936,2,21,5,62,6,0,54,27,0
Total reachable state count : 5

ITS tools runner thread asked to quit. Dying gracefully.
Arc [13:1*[(MOD (ADD $cpt 1) 51)]] contains successor/predecessor on variables of sort compteur
Arc [1:1*[(MOD (ADD $cA 1) 51)]] contains successor/predecessor on variables of sort voitureA
Arc [6:1*[(MOD (ADD (MOD (MINUS $cB 1) 51) 51) 51)]] contains successor/predecessor on variables of sort voitureB
Arc [14:1*[(MOD (ADD $s 1) 2)]] contains successor/predecessor on variables of sort sens
[2025-06-01 22:58:36] [INFO ] Unfolded HLPN to a Petri net with 168 places and 5408 transitions 42330 arcs in 231 ms.
[2025-06-01 22:58:36] [INFO ] Unfolded 10 HLPN properties in 4 ms.
[2025-06-01 22:58:40] [INFO ] Flatten gal took : 1314 ms
[2025-06-01 22:58:40] [INFO ] Flatten gal took : 699 ms
[2025-06-01 22:58:41] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality5557620618733787418.gal : 324 ms
[2025-06-01 22:58:41] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality11795232590566887789.prop : 334 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality5557620618733787418.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality11795232590566887789.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...329
RANDOM walk for 40000 steps (92 resets) in 19761 ms. (2 steps per ms) remains 5/10 properties
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-13 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-09 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-11 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-12 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Loading property file /tmp/ReachabilityCardinality11795232590566887789.prop.
BEST_FIRST walk for 26495 steps (16 resets) in 20007 ms. (1 steps per ms) remains 5/5 properties
BEST_FIRST walk for 40002 steps (34 resets) in 4347 ms. (9 steps per ms) remains 5/5 properties
BEST_FIRST walk for 29000 steps (29 resets) in 20009 ms. (1 steps per ms) remains 5/5 properties
BEST_FIRST walk for 40002 steps (28 resets) in 4630 ms. (8 steps per ms) remains 5/5 properties
SDD proceeding with computation,10 properties remain. new max is 4
SDD size :1 after 6
SDD proceeding with computation,10 properties remain. new max is 8
SDD size :6 after 16
SDD proceeding with computation,10 properties remain. new max is 16
SDD size :16 after 34
SDD proceeding with computation,10 properties remain. new max is 32
SDD size :34 after 68
BEST_FIRST walk for 17039 steps (12 resets) in 20011 ms. (0 steps per ms) remains 5/5 properties
Invariant property BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-07 does not hold.
[2025-06-01 22:58:59] [INFO ] Flow matrix only has 410 transitions (discarded 4998 similar events)
// Phase 1: matrix 410 rows 168 cols
[2025-06-01 22:58:59] [INFO ] Computed 7 invariants in 31 ms
[2025-06-01 22:58:59] [INFO ] State equation strengthened by 102 read => feed constraints.
Excessive predecessor constraint size, skipping predecessor.
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
Problem BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-14 is UNSAT
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-14 TRUE TECHNIQUES SMT_REFINEMENT
Problem BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-00 is UNSAT
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-00 FALSE TECHNIQUES SMT_REFINEMENT
Problem BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-06 is UNSAT
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-06 FALSE TECHNIQUES SMT_REFINEMENT
Problem BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-10 is UNSAT
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-10 FALSE TECHNIQUES SMT_REFINEMENT
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/164 variables, 4/4 constraints. Problems are: Problem set: 4 solved, 1 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/164 variables, 0/4 constraints. Problems are: Problem set: 4 solved, 1 unsolved
Problem BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-05 is UNSAT
FORMULA BridgeAndVehicles-COL-V50P20N50-ReachabilityFireability-2025-05 FALSE TECHNIQUES SMT_REFINEMENT
After SMT solving in domain Real declared 168/578 variables, and 7 constraints, problems are : Problem set: 5 solved, 0 unsolved in 928 ms.
Refiners :[Positive P Invariants (semi-flows): 7/7 constraints, State Equation: 0/168 constraints, ReadFeed: 0/102 constraints, PredecessorRefiner: 1/0 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
After SMT, in 1282ms problems are : Problem set: 5 solved, 0 unsolved
Skipping Parikh replay, no witness traces provided.
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
All properties solved without resorting to model-checking.
Total runtime 26104 ms.

BK_STOP 1748818741088

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

+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ ReachabilityFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202505121319.jar
+ VERSION=202505121319
+ echo 'Running Version 202505121319'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600

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="BridgeAndVehicles-COL-V50P20N50"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
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 2-5832"
echo " Executing tool itstools"
echo " Input is BridgeAndVehicles-COL-V50P20N50, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r016-smll-174853764700247"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/BridgeAndVehicles-COL-V50P20N50.tgz
mv BridgeAndVehicles-COL-V50P20N50 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;