fond
Model Checking Contest @ Petri Nets 2017
7th edition, Zaragoza, Spain, June 27, 2017
Execution of r091-ebro-149488438600364
Last Updated
June 27, 2017

About the Execution of MARCIE for S_Diffusion2D-PT-D05N050

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
7900.270 72554.00 72039.00 30.60 TTFTFTTTTTTTTFFF normal

Execution Chart

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

Trace from the execution

Waiting for the VM to be ready (probing ssh)
................
=====================================================================
Generated by BenchKit 2-3253
Executing tool marcie
Input is S_Diffusion2D-PT-D05N050, examination is CTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 1
Run identifier is r091-ebro-149488438600364
=====================================================================


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

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

The expected result is a vector of booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-0
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-1
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-10
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-11
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-12
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-13
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-14
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-15
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-2
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-3
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-4
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-5
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-6
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-7
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-8
FORMULA_NAME Diffusion2D-PT-D05N050-CTLFireability-9

=== Now, execution of the tool begins

BK_START 1495056964416

timeout --kill-after=10s --signal=SIGINT 1m for testing only

Marcie rev. 8852M (built: crohr on 2017-05-03)
A model checker for Generalized Stochastic Petri nets

authors: Alex Tovchigrechko (IDD package and CTL model checking)

Martin Schwarick (Symbolic numerical analysis and CSL model checking)

Christian Rohr (Simulative and approximative numerical model checking)

marcie@informatik.tu-cottbus.de

called as: marcie --net-file=model.pnml --mcc-file=CTLFireability.xml --memory=6

parse successfull
net created successfully

Net: Diffusion2D_PT_D05N050
(NrP: 25 NrTr: 144 NrArc: 288)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.000sec

net check time: 0m 0.000sec

init dd package: 0m 2.714sec

parse successfull
net created successfully

Net: Diffusion2D_PT_D05N050
(NrP: 25 NrTr: 144 NrArc: 288)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.000sec

net check time: 0m 0.000sec

init dd package: 0m 8.522sec


RS generation: 0m 0.860sec


-> reachability set: #nodes 1225 (1.2e+03) #states 17,529,515,713,716,297,876 (19)



starting MCC model checker
--------------------------

checking: AG [EF [IS_FIREABLE [t1_1_2_2_3]]]
normalized: ~ [E [true U ~ [E [true U IS_FIREABLE [t1_1_2_2_3]]]]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-1 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 1.621sec

checking: EF [IS_FIREABLE [t1_2_1_2_2]]
normalized: E [true U IS_FIREABLE [t1_2_1_2_2]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-13 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 0.602sec

checking: AG [~ [[AG [IS_FIREABLE [t1_4_4_3_3]] | AG [IS_FIREABLE [t1_5_2_5_3]]]]]
normalized: ~ [E [true U [~ [E [true U ~ [IS_FIREABLE [t1_4_4_3_3]]]] | ~ [E [true U ~ [IS_FIREABLE [t1_5_2_5_3]]]]]]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-0 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 2.219sec

checking: [EF [AX [~ [IS_FIREABLE [t1_4_4_3_4]]]] | ~ [EX [IS_FIREABLE [t1_3_3_4_2]]]]
normalized: [~ [EX [IS_FIREABLE [t1_3_3_4_2]]] | E [true U ~ [EX [IS_FIREABLE [t1_4_4_3_4]]]]]

..-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-5 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 5.369sec

checking: A [~ [AX [IS_FIREABLE [t1_3_4_3_5]]] U EX [IS_FIREABLE [t1_3_2_4_3]]]
normalized: [~ [EG [~ [EX [IS_FIREABLE [t1_3_2_4_3]]]]] & ~ [E [~ [EX [IS_FIREABLE [t1_3_2_4_3]]] U [~ [EX [~ [IS_FIREABLE [t1_3_4_3_5]]]] & ~ [EX [IS_FIREABLE [t1_3_2_4_3]]]]]]]

.....
EG iterations: 1
-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-14 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 3.412sec

checking: [IS_FIREABLE [t1_2_5_1_4] | AG [[~ [IS_FIREABLE [t1_4_3_4_4]] | EF [IS_FIREABLE [t1_4_2_3_1]]]]]
normalized: [~ [E [true U ~ [[E [true U IS_FIREABLE [t1_4_2_3_1]] | ~ [IS_FIREABLE [t1_4_3_4_4]]]]]] | IS_FIREABLE [t1_2_5_1_4]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-2 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 0.803sec

checking: AG [EF [[~ [IS_FIREABLE [t1_1_2_1_1]] & [IS_FIREABLE [t1_2_1_3_1] | IS_FIREABLE [t1_4_4_5_5]]]]]
normalized: ~ [E [true U ~ [E [true U [[IS_FIREABLE [t1_2_1_3_1] | IS_FIREABLE [t1_4_4_5_5]] & ~ [IS_FIREABLE [t1_1_2_1_1]]]]]]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-4 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 4.728sec

checking: [[EG [IS_FIREABLE [t1_4_5_5_4]] | EF [EX [IS_FIREABLE [t1_4_2_4_3]]]] & IS_FIREABLE [t1_3_1_2_1]]
normalized: [[E [true U EX [IS_FIREABLE [t1_4_2_4_3]]] | EG [IS_FIREABLE [t1_4_5_5_4]]] & IS_FIREABLE [t1_3_1_2_1]]

.
EG iterations: 1
.-> the formula is FALSE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-10 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 1.061sec

checking: EF [[~ [~ [[IS_FIREABLE [t1_3_1_4_2] & IS_FIREABLE [t1_4_2_4_3]]]] & ~ [[IS_FIREABLE [t1_5_3_4_2] | ~ [IS_FIREABLE [t1_2_1_2_2]]]]]]
normalized: E [true U [~ [[~ [IS_FIREABLE [t1_2_1_2_2]] | IS_FIREABLE [t1_5_3_4_2]]] & [IS_FIREABLE [t1_3_1_4_2] & IS_FIREABLE [t1_4_2_4_3]]]]

-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-6 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 2.834sec

checking: [[[IS_FIREABLE [t1_2_2_3_2] & E [IS_FIREABLE [t1_1_5_1_4] U IS_FIREABLE [t1_3_4_2_4]]] | IS_FIREABLE [t1_3_4_3_3]] | EG [IS_FIREABLE [t1_3_4_3_5]]]
normalized: [EG [IS_FIREABLE [t1_3_4_3_5]] | [[E [IS_FIREABLE [t1_1_5_1_4] U IS_FIREABLE [t1_3_4_2_4]] & IS_FIREABLE [t1_2_2_3_2]] | IS_FIREABLE [t1_3_4_3_3]]]

.
EG iterations: 1
-> the formula is FALSE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-8 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 3.505sec

checking: [A [EX [IS_FIREABLE [t1_3_2_3_1]] U AF [IS_FIREABLE [t1_4_4_5_4]]] & [IS_FIREABLE [t1_4_1_3_2] | ~ [E [IS_FIREABLE [t1_4_5_5_5] U IS_FIREABLE [t1_2_5_2_4]]]]]
normalized: [[~ [E [IS_FIREABLE [t1_4_5_5_5] U IS_FIREABLE [t1_2_5_2_4]]] | IS_FIREABLE [t1_4_1_3_2]] & [~ [EG [EG [~ [IS_FIREABLE [t1_4_4_5_4]]]]] & ~ [E [EG [~ [IS_FIREABLE [t1_4_4_5_4]]] U [~ [EX [IS_FIREABLE [t1_3_2_3_1]]] & EG [~ [IS_FIREABLE [t1_4_4_5_4]]]]]]]]

.
EG iterations: 1
..
EG iterations: 1
.
EG iterations: 1
.
EG iterations: 1
-> the formula is FALSE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-9 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m14.849sec

checking: [~ [AG [[~ [IS_FIREABLE [t1_3_1_3_2]] | IS_FIREABLE [t1_3_1_3_2]]]] | [[IS_FIREABLE [t1_3_2_3_1] & IS_FIREABLE [t1_4_1_5_1]] & [~ [~ [IS_FIREABLE [t1_3_1_3_2]]] & AF [[IS_FIREABLE [t1_1_3_1_2] | IS_FIREABLE [t1_2_4_2_5]]]]]]
normalized: [[[~ [EG [~ [[IS_FIREABLE [t1_1_3_1_2] | IS_FIREABLE [t1_2_4_2_5]]]]] & IS_FIREABLE [t1_3_1_3_2]] & [IS_FIREABLE [t1_3_2_3_1] & IS_FIREABLE [t1_4_1_5_1]]] | E [true U ~ [[~ [IS_FIREABLE [t1_3_1_3_2]] | IS_FIREABLE [t1_3_1_3_2]]]]]

.
EG iterations: 1
-> the formula is FALSE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-7 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 0.558sec

checking: ~ [A [[[IS_FIREABLE [t1_3_3_4_3] & IS_FIREABLE [t1_2_5_1_5]] & [IS_FIREABLE [t1_4_2_4_3] & IS_FIREABLE [t1_5_3_5_4]]] U [[IS_FIREABLE [t1_3_5_2_5] | IS_FIREABLE [t1_5_3_4_3]] | IS_FIREABLE [t1_3_4_3_5]]]]
normalized: ~ [[~ [EG [~ [[[IS_FIREABLE [t1_3_5_2_5] | IS_FIREABLE [t1_5_3_4_3]] | IS_FIREABLE [t1_3_4_3_5]]]]] & ~ [E [~ [[[IS_FIREABLE [t1_3_5_2_5] | IS_FIREABLE [t1_5_3_4_3]] | IS_FIREABLE [t1_3_4_3_5]]] U [~ [[[IS_FIREABLE [t1_4_2_4_3] & IS_FIREABLE [t1_5_3_5_4]] & [IS_FIREABLE [t1_3_3_4_3] & IS_FIREABLE [t1_2_5_1_5]]]] & ~ [[[IS_FIREABLE [t1_3_5_2_5] | IS_FIREABLE [t1_5_3_4_3]] | IS_FIREABLE [t1_3_4_3_5]]]]]]]]

.
EG iterations: 1
-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-11 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 1.187sec

checking: [[~ [~ [IS_FIREABLE [t1_3_4_4_3]]] | [~ [EG [IS_FIREABLE [t1_1_2_2_2]]] & AX [[IS_FIREABLE [t1_2_2_3_1] | IS_FIREABLE [t1_3_3_3_4]]]]] & EF [[~ [IS_FIREABLE [t1_3_2_3_3]] | [[IS_FIREABLE [t1_4_5_3_5] & IS_FIREABLE [t1_4_2_3_2]] | [IS_FIREABLE [t1_3_3_4_4] | IS_FIREABLE [t1_4_4_3_5]]]]]]
normalized: [E [true U [[[IS_FIREABLE [t1_3_3_4_4] | IS_FIREABLE [t1_4_4_3_5]] | [IS_FIREABLE [t1_4_5_3_5] & IS_FIREABLE [t1_4_2_3_2]]] | ~ [IS_FIREABLE [t1_3_2_3_3]]]] & [[~ [EX [~ [[IS_FIREABLE [t1_2_2_3_1] | IS_FIREABLE [t1_3_3_3_4]]]]] & ~ [EG [IS_FIREABLE [t1_1_2_2_2]]]] | IS_FIREABLE [t1_3_4_4_3]]]

.
EG iterations: 1
.-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-15 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 2.121sec

checking: [[[~ [EX [IS_FIREABLE [t1_2_4_2_3]]] & [AG [IS_FIREABLE [t1_5_3_5_2]] | [IS_FIREABLE [t1_5_4_5_5] & IS_FIREABLE [t1_3_4_2_4]]]] | EF [[IS_FIREABLE [t1_3_2_3_3] & [IS_FIREABLE [t1_1_2_1_1] & IS_FIREABLE [t1_1_5_2_4]]]]] | ~ [E [[IS_FIREABLE [t1_2_2_2_1] & IS_FIREABLE [t1_4_2_5_1]] U ~ [IS_FIREABLE [t1_4_3_4_4]]]]]
normalized: [~ [E [[IS_FIREABLE [t1_2_2_2_1] & IS_FIREABLE [t1_4_2_5_1]] U ~ [IS_FIREABLE [t1_4_3_4_4]]]] | [E [true U [IS_FIREABLE [t1_3_2_3_3] & [IS_FIREABLE [t1_1_2_1_1] & IS_FIREABLE [t1_1_5_2_4]]]] | [[[IS_FIREABLE [t1_5_4_5_5] & IS_FIREABLE [t1_3_4_2_4]] | ~ [E [true U ~ [IS_FIREABLE [t1_5_3_5_2]]]]] & ~ [EX [IS_FIREABLE [t1_2_4_2_3]]]]]]

.-> the formula is TRUE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-3 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 7.562sec

checking: AX [[[[[IS_FIREABLE [t1_3_4_4_4] & IS_FIREABLE [t1_5_3_4_4]] & ~ [IS_FIREABLE [t1_2_2_3_3]]] | ~ [[IS_FIREABLE [t1_2_1_2_2] & IS_FIREABLE [t1_2_1_3_1]]]] & [IS_FIREABLE [t1_4_4_4_3] & [[IS_FIREABLE [t1_2_4_3_3] & IS_FIREABLE [t1_1_2_2_3]] | [IS_FIREABLE [t1_3_3_4_2] | IS_FIREABLE [t1_1_3_2_3]]]]]]
normalized: ~ [EX [~ [[[IS_FIREABLE [t1_4_4_4_3] & [[IS_FIREABLE [t1_3_3_4_2] | IS_FIREABLE [t1_1_3_2_3]] | [IS_FIREABLE [t1_2_4_3_3] & IS_FIREABLE [t1_1_2_2_3]]]] & [~ [[IS_FIREABLE [t1_2_1_2_2] & IS_FIREABLE [t1_2_1_3_1]]] | [~ [IS_FIREABLE [t1_2_2_3_3]] & [IS_FIREABLE [t1_3_4_4_4] & IS_FIREABLE [t1_5_3_4_4]]]]]]]]

.-> the formula is FALSE

FORMULA Diffusion2D-PT-D05N050-CTLFireability-12 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS UNFOLDING_TO_PT

MC time: 0m 1.537sec

totally nodes used: 845826 (8.5e+05)
number of garbage collections: 0
fire ops cache: hits/miss/sum: 320648963 14453743 335102706
used/not used/entry size/cache size: 13370720 53738144 16 1024MB
basic ops cache: hits/miss/sum: 15648097 689822 16337919
used/not used/entry size/cache size: 1198740 15578476 12 192MB
unary ops cache: hits/miss/sum: 0 0 0
used/not used/entry size/cache size: 0 16777216 8 128MB
abstract ops cache: hits/miss/sum: 0 0 0
used/not used/entry size/cache size: 0 16777216 12 192MB
state nr cache: hits/miss/sum: 29325 1225 30550
used/not used/entry size/cache size: 1225 8387383 32 256MB
max state cache: hits/miss/sum: 0 0 0
used/not used/entry size/cache size: 0 8388608 32 256MB
uniqueHash elements/entry size/size: 67108864 4 256MB
0 66288010
1 797882
2 21311
3 1495
4 121
5 2
6 1
7 0
8 41
9 1
>= 10 0

Total processing time: 1m12.305sec


BK_STOP 1495057036970

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

check for maximal unmarked siphon
ok
check for constant places
ok
check if there are places and transitions
ok
check if there are transitions without pre-places
ok
check if at least one transition is enabled in m0
ok
check if there are transitions that can never fire
ok

ptnet_zbdd.cc:255: Boundedness exception: net is not 1-bounded!

check for maximal unmarked siphon
ok
check for constant places
ok
check if there are places and transitions
ok
check if there are transitions without pre-places
ok
check if at least one transition is enabled in m0
ok
check if there are transitions that can never fire
ok


initing FirstDep: 0m 0.001sec


iterations count:42944 (298), effective:1200 (8)

initing FirstDep: 0m 0.000sec


iterations count:1006 (6), effective:24 (0)

iterations count:1006 (6), effective:24 (0)

iterations count:1044 (7), effective:50 (0)

iterations count:5944 (41), effective:50 (0)

iterations count:23944 (166), effective:450 (3)

iterations count:1004 (6), effective:30 (0)

iterations count:1003 (6), effective:24 (0)

iterations count:2507 (17), effective:72 (0)

iterations count:643 (4), effective:16 (0)

iterations count:4323 (30), effective:119 (0)

iterations count:1003 (6), effective:24 (0)

iterations count:18644 (129), effective:450 (3)

iterations count:1004 (6), effective:24 (0)

iterations count:144 (1), effective:0 (0)

iterations count:430 (2), effective:13 (0)

iterations count:1844 (12), effective:50 (0)

iterations count:2729 (18), effective:72 (0)

iterations count:4944 (34), effective:48 (0)

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="S_Diffusion2D-PT-D05N050"
export BK_EXAMINATION="CTLFireability"
export BK_TOOL="marcie"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"

# 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

tar xzf /home/mcc/BenchKit/INPUTS/S_Diffusion2D-PT-D05N050.tgz
mv S_Diffusion2D-PT-D05N050 execution

# this is for BenchKit: explicit launching of the test

cd execution
echo "====================================================================="
echo " Generated by BenchKit 2-3253"
echo " Executing tool marcie"
echo " Input is S_Diffusion2D-PT-D05N050, examination is CTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 1"
echo " Run identifier is r091-ebro-149488438600364"
echo "====================================================================="
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "CTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLFireability" != "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 "CTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLFireability.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 '' CTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
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 ;