30 50
DAB DAA CDD CDC CDB CDA CCD CCC CCB CCA CBD CBC CBB CBA CAD CAC CAB CAA BDD BDC BDB BDA BCD BCC BCB BCA BBD BBC BBB BBA BAD BAC BAB BAA ADD DC DB DA CD CC CB CA BD BC BB BA AD C B A 
DAC DAB DAA CDD CDC CDB CDA CCD CCC CCB CCA CBD CBC CBB CBA CAD CAC CAB CAA BDD BDC BDB BDA BCD BCC BCB BCA BBD BBC BBB BBA BAD BAC BAB BAA DD DC DB DA CD CC CB CA BD BC BB BA D C B