a-a a-b aaa aab aam aao aap aas aax ab- aba abb abm abo abp abs abx ama amb amm amo amp ams amx aoa aob aom aoo aop aos aox ap- apa apb apm apo app aps apx as- asa asb asm aso asp ass asx ax- axa axm axo axp axs axx b-p baa bab bam bao bap bas bax bba bbb bbm bbo bbp bbs bbx bma bmb bmm bmo bmp bms bmx boa bob bom boo bop bos box bpa bpb bpm bpo bpp bps bpx bsa bsb bsm bso bsp bss bsx bxb bxm bxo bxx m-o maa mab mam mao map mas max mba mbb mbm mbo mbp mbs mbx mma mmb mmm mmo mmp mms mmx moa mob mom moo mop mos mox mpa mpb mpm mpo mpp mps mpx msa msb msm mso msp mss msx mxa mxp mxs oaa oab oam oao oap oas oax ob- oba obb obm obo obp obs obx om- oma omb omm omo omp oms omx oo- ooa oob oom ooo oop oos oox op- opa opb opm opo opp ops opx os- osa osb osm oso osp oss osx ox- oxa oxb oxo oxx p-p paa pab pam pao pap pas pax pba pbb pbm pbo pbp pbs pbx pma pmb pmm pmo pmp pms pmx poa pob pom poo pop pos pox ppa ppb ppm ppo ppp pps ppx ps- psa psb psm pso psp pss psx pxm pxs saa sab sam sao sap sas sax sba sbb sbm sbo sbp sbs sbx sma smb smm smo smp sms smx soa sob som soo sop sos sox spa spb spm spo spp sps spx ss- ssa ssb ssm sso ssp sss ssx sxm sxs xaa xam xap xas xbx xma xmm xmo xmp xms xmx xoa xom xoo xop xos xox xpa xpb xpm xpo xpp xps xsa xsb xsm xsp xss xxo xxp xxx