YES activeandttXmarkXactiveplusN0markNactiveplusNsMmarksplusNMactiveandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXandmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXtopmarkXtopproperXtopokXtopactiveX2.11active111and21112tt00mark111plus212122000s111proper111ok111top111activeandttXmarkXactiveplusNsMmarksplusNMactiveandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXandmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXtopmarkXtopproperXtopokXtopactiveX1active111and221112tt00mark111plus22122s111proper111ok111000top111activeplusNsMmarksplusNMactiveandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXandmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXtopmarkXtopproperXtopokXtopactiveX1active111plus22122s1211mark111and22122proper111tt00ok111000top111activeandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXandmarkX1X2markandX1X2plusmarkX1X2markplusX1X2plusX1markX2markplusX1X2smarkXmarksXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXtopmarkXtopproperXtopokXtopactiveX1active111and22122plus22122s121mark1111proper111tt00ok111000top121activeandX1X2andactiveX1X2activeplusX1X2plusactiveX1X2activeplusX1X2plusX1activeX2activesXsactiveXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksXtopokXtopactiveX1active1121and221112plus221112s111proper1221tt00ok1221000top111activesXsactiveXproperandX1X2andproperX1properX2properttokttproperplusX1X2plusproperX1properX2proper0ok0propersXsproperXandokX1okX2okandX1X2plusokX1okX2okplusX1X2sokXoksX1active1121s1221proper121and212122tt01ok1111plus211112002properttoktt1proper121tt02ok1111AProVEAProVE 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