time LAV -solver=Boolector-BV-ARR-ACK -find-first-flawed -model -loop-unroll-begin=4 -loop-unroll-end=0 
ff.c

time LAV -solver=Boolector-BV-ARR-ACK -find-first-flawed -model -loop-unroll-begin=4 -loop-unroll-end=0 
fff.c

time LAV -solver=Boolector-BV-ARR-ACK -find-first-flawed -model -loop-unroll-begin=4 -loop-unroll-end=0 
ffff.c


