About the Execution of LoLa for IOTPpurchase-PT-C01M01P01D01
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
118.410 | 92.00 | 20.00 | 0.00 | FTTFFTTTFTFFFFTT | 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 2-2979
Executing tool lola
Input is IOTPpurchase-PT-C01M01P01D01, examination is CTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r062kn-blw3-146358896700066
=====================================================================
--------------------
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 IOTPpurchase-PT-C01M01P01D01-CTLCardinality-0
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-1
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-10
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-11
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-12
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-13
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-14
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-15
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-2
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-3
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-4
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-5
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-6
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-7
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-8
FORMULA_NAME IOTPpurchase-PT-C01M01P01D01-CTLCardinality-9
=== Now, execution of the tool begins
BK_START 1463590806292
bkconf 3600
make: Nothing to be done for 'prepare'.
in benchkit_head lolaszeit 3540
CTLCardinality @ IOTPpurchase-PT-C01M01P01D01
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-0 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-1 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-2 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-3 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-4 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-5 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-6 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-7 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-8 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-9 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-10 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-11 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-12 FALSE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-13 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-14 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
FORMULA IOTPpurchase-PT-C01M01P01D01-CTLCardinality-15 TRUE TECHNIQUES PARALLEL_PROCESSING EXPLICIT SAT_SMT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL
lola: LoLA will run for 3540 seconds at most (--timelimit)
lola: NET
lola: reading net from model.pnml.lola
lola: finished parsing
lola: closed net file model.pnml.lola
lola: 156/65536 symbol table entries, 0 collisions
lola: preprocessing...
lola: finding significant places
lola: 111 places, 45 transitions, 44 significant places
lola: computing forward-conflicting sets
lola: computing back-conflicting sets
lola: 70 transition conflict sets
lola: TASK
lola: reading formula from IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: read: (1 <= ConsumerPayment_p3 OR (2 <= p11_3 AND (!((Status_p21_11 <= p3_4 AND 3 <= DeliveryNote_p22_14)) OR ((3 <= PaymentAmount_p11_6 OR Payment_p21_1 <= p11_4) OR (DeliveryRequest_p12_5 <= p7_1 AND PaySchemeData_p11_10 <= OfferRequest_p10))))) : (2 <= PayReceipt_p21_15 OR (!(!((1 <= p4_1 OR p7_3 <= p1_1))) OR 3 <= PaySchemeData_p21_6)) : !(EX (DeliveryNote_p22_14 <= p4_4)) : 1 <= p12_3 : AX (!(!(1 <... (shortened)
lola: formula length: 1165
lola: computing a collection of formulas
lola: RUNNING
lola: subprocess 0 will run for 221 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: (-ConsumerPayment_p3 <= -1 OR (-p11_3 <= -2 AND (Status_p21_11 + -p3_4 > 0 OR (-DeliveryNote_p22_14 > -3 OR (-PaymentAmount_p11_6 <= -3 OR (-p11_4 + Payment_p21_1 <= 0 OR (-p7_1 + DeliveryRequest_p12_5 <= 0 AND -OfferRequest_p10 + PaySchemeData_p11_10 <= 0)))))))
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 8 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: no
lola: The net violates the given property already in its initial state.
lola: ========================================
lola: subprocess 1 will run for 236 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: (-PayReceipt_p21_15 <= -2 OR (-p4_1 <= -1 OR (p7_3 + -p1_1 <= 0 OR -PaySchemeData_p21_6 <= -3)))
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 4 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the property already in its initial state.
lola: ========================================
lola: subprocess 2 will run for 252 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: AX (DeliveryNote_p22_14 + -p4_4 > 0)
lola: ========================================
lola: SUBTASK
lola: checking CTL
lola: processed formula: AX(DeliveryNote_p22_14 + -p4_4 > 0)
lola: processed formula length: 35
lola: 194 rewrites
lola: formula mentions 2 of 111 places; total mentions: 2
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: RUNNING
lola: CTL formula contains 0 significant temporal operators and needs 0 bytes of payload
lola: SUBRESULT
lola: result: no
lola: The net does not satisfy the given formula.
lola: ========================================
lola: subprocess 3 will run for 272 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: -p12_3 <= -1
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the property already in its initial state.
lola: ========================================
lola: subprocess 4 will run for 295 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: AX (-Organization_p20_7 <= -1)
lola: ========================================
lola: SUBTASK
lola: checking CTL
lola: processed formula: AX(-Organization_p20_7 <= -1)
lola: processed formula length: 29
lola: 194 rewrites
lola: formula mentions 1 of 111 places; total mentions: 1
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: RUNNING
lola: CTL formula contains 0 significant temporal operators and needs 0 bytes of payload
lola: SUBRESULT
lola: result: no
lola: The net does not satisfy the given formula.
lola: ========================================
lola: subprocess 5 will run for 321 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: -BrandList_p11_2 + Status_p22_13 > 0
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: no
lola: The net violates the given property already in its initial state.
lola: ========================================
lola: subprocess 6 will run for 354 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: AG ((-p6_1 + DeliveryHandlerDelivery_p8_0 <= 0 OR -p5_3 <= -2))
lola: ========================================
lola: SUBTASK
lola: checking invariance
lola: Planning: workflow for reachability check: search (--findpath=off)
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using reachability graph (--search=depth)
lola: using reachability preserving stubborn set method with insertion algorithm (--stubborn=tarjan)
lola: RUNNING
lola: SUBRESULT
lola: result: no
lola: The predicate is not invariant.
lola: ========================================
lola: subprocess 7 will run for 393 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: -Delivery_p22_8 <= -2
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: no
lola: The net violates the given property already in its initial state.
lola: ========================================
lola: subprocess 8 will run for 442 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: AG (((-p5_1 + p11_0 <= 0 OR (-p4_4 <= -3 OR -p5_3 > -3)) AND (Order_p20 + -p8_1 <= 0 OR (-DeliveryNote_p22_14 + p6_5 <= 0 OR (-PaymentRequest_p11_9 <= -2 AND Organization_p21_4 + -PaymentHandlerPayment_p5_0 <= 0)))))
lola: ========================================
lola: SUBTASK
lola: checking invariance
lola: Planning: workflow for reachability check: search (--findpath=off)
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using reachability graph (--search=depth)
lola: using reachability preserving stubborn set method with insertion algorithm (--stubborn=tarjan)
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The predicate is invariant.
lola: ========================================
lola: subprocess 9 will run for 505 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: Order_p22_10 + -p4_3 <= 0
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the property already in its initial state.
lola: ========================================
lola: subprocess 10 will run for 590 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: HowDeliver_p12_2 + -Status_p21_9 <= 0
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the property already in its initial state.
lola: ========================================
lola: subprocess 11 will run for 708 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MerchantPayment_p4_0 + -p6_4 > 0
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: no
lola: The net violates the given property already in its initial state.
lola: ========================================
lola: subprocess 12 will run for 885 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: AG (EX (p11_13 + -p11_7 <= 0))
lola: ========================================
lola: SUBTASK
lola: checking CTL
lola: processed formula: !(E(TRUE U !(EX(p11_13 + -p11_7 <= 0))))
lola: processed formula length: 40
lola: 195 rewrites
lola: formula mentions 2 of 111 places; total mentions: 2
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: RUNNING
lola: CTL formula contains 1 significant temporal operators and needs 5 bytes of payload
lola: SUBRESULT
lola: result: no
lola: The net does not satisfy the given formula.
lola: ========================================
lola: subprocess 13 will run for 1180 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: -p7_2 + BrandSelection_p11_5 <= 0
lola: ========================================
lola: SUBTASK
lola: checking initial satisfaction
lola: processed formula with 1 atomic propositions
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the property already in its initial state.
lola: ========================================
lola: subprocess 14 will run for 1770 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: ((EF (-p6_7 + p5_2 <= 0) AND EX (-Organization_p21_2 + p6_7 <= 0)) OR (-p8_3 > -3 OR (AX (-p4_2 + p2_2 <= 0) OR (-p6_4 <= -2 OR (EF (Order_p20 + -WhatDeliver_p12_1 <= 0) OR EX (-WhatDeliver_p12_1 <= -1))))))
lola: ========================================
lola: SUBTASK
lola: checking a Boolean combination of formulas
lola: RUNNING
lola: subprocess 14 will run for 1770 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: EF (-p6_7 + p5_2 <= 0)
lola: ========================================
lola: SUBTASK
lola: checking reachability
lola: Planning: workflow for reachability check: search (--findpath=off)
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using reachability graph (--search=depth)
lola: using reachability preserving stubborn set method with insertion algorithm (--stubborn=tarjan)
lola: RUNNING
lola: SUBRESULT
lola: result: yes
lola: The predicate is reachable.
lola: ========================================
lola: subprocess 15 will run for 3540 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: EX (-Organization_p21_2 + p6_7 <= 0)
lola: ========================================
lola: SUBTASK
lola: checking CTL
lola: processed formula: EX(-Organization_p21_2 + p6_7 <= 0)
lola: processed formula length: 35
lola: 194 rewrites
lola: formula mentions 2 of 111 places; total mentions: 2
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: RUNNING
lola: CTL formula contains 0 significant temporal operators and needs 0 bytes of payload
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the given formula.
lola: ========================================
lola: SUBRESULT
lola: result: yes
lola: The Boolean predicate is true.
lola: ========================================
lola: subprocess 15 will run for 3540 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: E(EF (p11_0 + -Status_p21_5 <= 0) U (-p6_4 > -1 AND -Payment_p21_7 + p11_3 > 0))
lola: ========================================
lola: SUBTASK
lola: checking CTL
lola: processed formula: E(E(TRUE U p11_0 + -Status_p21_5 <= 0) U (-p6_4 > -1 AND -Payment_p21_7 + p11_3 > 0))
lola: processed formula length: 85
lola: 195 rewrites
lola: formula mentions 5 of 111 places; total mentions: 5
lola: closed formula file IOTPpurchase-PT-C01M01P01D01-CTLCardinality.task
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 176 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: RUNNING
lola: CTL formula contains 2 significant temporal operators and needs 9 bytes of payload
lola: SUBRESULT
lola: result: yes
lola: The net satisfies the given formula.
lola: ========================================
lola: RESULT
lola: summary: no yes no yes no no no no yes yes yes no no yes yes yes
BK_STOP 1463590806384
--------------------
content from stderr:
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="IOTPpurchase-PT-C01M01P01D01"
export BK_EXAMINATION="CTLCardinality"
export BK_TOOL="lola"
export BK_RESULT_DIR="/home/hulinhub/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/IOTPpurchase-PT-C01M01P01D01.tgz
mv IOTPpurchase-PT-C01M01P01D01 execution
# this is for BenchKit: explicit launching of the test
cd execution
echo "====================================================================="
echo " Generated by BenchKit 2-2979"
echo " Executing tool lola"
echo " Input is IOTPpurchase-PT-C01M01P01D01, examination is CTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r062kn-blw3-146358896700066"
echo "====================================================================="
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "CTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLCardinality" != "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 "CTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLCardinality.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 '
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 ;