a-a a-c aaa aac aao aap aar aax aay ac- aca acc aco acp acr acx acy aoa aoc aoo aop aor aox ap- apa apc apo app apr apx apy ar- ara arc aro arp arr arx ary ax- axa axo axp axr axx ay- aya ayc ayo ayp ayr ayx c-- caa cac cao cap car cax cay cca ccc cco ccp ccr ccx co- coa coc coo cop cor cox coy cpa cpc cpo cpp cpr cpx cra crc cro crp crr crx cry cxc cxo cxp cxr cxx cya cyc cyo cyp cyr oaa oac oao oap oar oax oc- oca occ oco ocp ocr ocx oo- ooa ooc ooo oop oor oox op- opa opc opo opp opr opx opy or- ora orc oro orp orr orx ory ox- oxa oxc oxo oxx oxy oya oyo p-p paa pac pao pap par pax pay pca pcc pco pcp pcr pcx poa poc poo pop por pox poy ppa ppc ppo ppp ppr ppx pra prc pro prp prr prx pry pxc pxr py- pya pyc pyo pyr pyx ra- raa rac rao rap rar rax ray rca rcc rco rcp rcr rcx roa roc roo rop ror rox roy rpa rpc rpo rpp rpr rpx rra rrc rrp rrr rxp rxr ry- rya ryc ryo ryr ryy xaa xac xap xar xcp xcr xcx xoa xoc xoo xop xor xox xpa xpc xpo xpp xrc xrx xry xxo xxp xxx xxy xyp xyr xyy yaa yac yao yap yar yax yay yca ycc yco ycp ycy yoc yoo yop yor yox yoy ypa ypo yra yrc yro yrp yxa yxy yyc yyy