a-a a-b a-c aaa aab aac aah aao aap aar aay ab- aba abb abc abh abo abp abr aby ac- aca acb acc ach aco acp acr acy aha ahb ahc ahh aho ahp ahr ahy aoa aob aoc aoh aoo aop aor ap- apa apb apc aph apo app apr apy ar- ara arb arc arh aro arp arr ary ay- aya ayc ayh ayo ayp ayr b-p baa bab bac bah bao bap bar bay bba bbb bbc bbh bbo bbp bbr bby bca bcb bcc bch bco bcp bcr bcy bha bhb bhc bhh bho bhp bhr boa bob boc boh boo bop bor boy bpa bpb bpc bph bpo bpp bpr bpy bra brb brh bro brp brr bry by- bya byc byh byo byp byr c-- caa cab cac cah cao cap car cay cba cbb cbc cbh cbo cbp cbr cby cca ccb ccc cch cco ccp ccr ch- cha chb chc chh cho chp chr chy co- coa cob coc coh coo cop cor coy cpa cpb cpc cph cpo cpp cpr cra crb crc crh cro crp crr cry cya cyb cyc cyo cyp cyr haa hab hac hah hao hap har hay hba hbb hbc hbh hbo hbp hbr hby hca hcb hcc hch hco hcp hcr hcy hha hhb hhc hhh hho hhp hhr hhy hoa hob hoc hoh hoo hop hor hoy hpa hpb hpc hph hpo hpp hpr hpy hr- hra hrb hrc hrh hro hrp hrr hy- hya hyb hyc hyh hyo hyp hyr hyy oaa oab oac oah oao oap oar ob- oba obb obc obh obo obp obr oby oc- oca ocb occ och oco ocp ocr oha ohc ohh oho ohp ohr oo- ooa oob ooc ooh ooo oop oor op- opa opb opc oph opo opp opr opy or- ora orb orc orh oro orp orr ory oya oyo p-p paa pab pac pah pao pap par pay pba pbb pbc pbo pbp pbr pby pca pcb pcc pch pco pcp pcr pha phb phc pho php phr phy poa pob poc poh poo pop por poy ppa ppb ppc pph ppo ppp ppr pra prb prc prh pro prp prr pry py- pya pyb pyc pyo pyr ra- raa rab rac rah rao rap rar ray rba rbb rbc rbh rbo rbp rbr rca rcb rcc rch rco rcp rcr rh- rha rhb rhc rhh rho rhp rhr roa rob roc roh roo rop ror roy rpa rpb rpc rph rpo rpp rpr rra rrb rrc rrh rrp rrr ry- rya ryc ryo ryr ryy yaa yab yac yah yao yap yar yay ybc ybp ybr yby yca ycc ych yco ycp ycy yha yhc yob yoc yoo yop yor yoy ypa ypo yra yrc yro yrp yyb yyc yyy