a-a a-b aaa aab aao aap aaw aax aay ab- aba abb abo abp abw abx aby aoa aob aoo aop aow aox ap- apa apb apo app apw apx apy aw- awa awb awo awp aww awy ax- axa axo axp axx ay- aya ayo ayp ayw ayx b-p baa bab bao bap baw bax bay bba bbb bbo bbp bbw bbx bby boa bob boo bop bow box boy bpa bpb bpo bpp bpw bpx bpy bwa bwb bwo bwp bwy bxb bxo bxw bxx by- bya byo byp oaa oab oao oap oaw oax ob- oba obb obo obp obw obx oby oo- ooa oob ooo oop oow oox op- opa opb opo opp opw opx opy owa owb owo owp oww ox- oxa oxb oxo oxx oxy oya oyo p-p paa pab pao pap paw pax pay pba pbb pbo pbp pbw pbx pby poa pob poo pop pow pox poy ppa ppb ppo ppp ppw ppx pwa pwb pwo pwp py- pya pyb pyo pyx waa wab wao wap waw wax way wba wbb wbo wbw wbx woa wob woo wop wow wox woy wpa wpb wpo wpp wpx wpy wwa wwo wwp www wxp wxw wxy wy- wya wyo wyp xaa xap xbx xoa xoo xop xox xpa xpb xpo xpp xpw xwa xwp xxo xxp xxx xxy xyp xyy yaa yab yao yap yaw yax yay ybp yby yob yoo yop yow yox yoy ypa ypo yxa yxy yyb yyy