YES activeandttXmarkXactiveplusN0markNactiveplusNsMmarksplusNMactivexN0mark0activexNsMmarkplusxNMNactiveandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXactivexX1X2xactiveX1X2activexX1X2xX1activeX2andmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXxmarkX1X2markxX1X2xX1markX2markxX1X2properandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXproperxX1X2xproperX1properX2andokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXxokX1okX2okxX1X2topmarkXtopproperXtopokXtopactiveX2.1and20tt01plus22003s10x23top14active11and212tt0mark11plus21200s11x212proper11ok11top11activeandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXactivexX1X2xactiveX1X2activexX1X2xX1activeX2andmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXxmarkX1X2markxX1X2xX1markX2markxX1X2properandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXproperxX1X2xproperX1properX2andokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXxokX1okX2okxX1X2topmarkXtopproperXtopokXtopactiveX1active111and22122plus22122s121x22122mark1111proper111tt00ok111000top121activeandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXactivexX1X2xactiveX1X2activexX1X2xX1activeX2properandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXproperxX1X2xproperX1properX2andokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXxokX1okX2okxX1X2topokXtopactiveX1active1121and221112plus221112s111x221112proper1221tt01ok1221000top111activesXsactiveXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXproperxX1X2xproperX1properX2andokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXxokX1okX2okxX1X2active12s11and20tt03plus20004x25active11s11proper11and212tt0ok11plus21200x212properandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXproperxX1X2xproperX1properX2andokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXxokX1okX2okxX1X21proper121and211112tt01ok1111plus21122002s1111x212122properttokttproperplusX1X2plusproperX1properX2sokXoksX1proper121tt02ok1211plus222122s1221properttokttproper10tt00proper11tt0ok11AProVEAProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty Statistics for single proof: 100.00 % (8 real / 0 unknown / 0 assumptions / 8 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe