a-a a-b a-c aaa aab aac aah aar aaw ab- aba abb abc abh abr abw ac- aca acb acc ach acr acw aha ahb ahc ahh ahr ahw ar- ara arb arc arh arr arw aw- awa awb awc awh awr aww baa bab bac bah bar baw bba bbb bbc bbh bbr bbw bca bcb bcc bch bcr bha bhb bhc bhh bhr bhw bra brb brh brr brw bwa bwb bwc bwh bwr c-- caa cab cac cah car caw cba cbb cbc cbh cbr cbw cca ccb ccc cch ccr ccw ch- cha chb chc chh chr chw cra crb crc crh crr crw cw- cwa cwb cwc cwh cwr haa hab hac hah har haw hba hbb hbc hbh hbr hbw hca hcb hcc hch hcr hcw hha hhb hhc hhh hhr hhw hr- hra hrb hrc hrh hrr hrw hw- hwa hwb hwr hww ra- raa rab rac rah rar raw rba rbb rbc rbh rbr rbw rca rcb rcc rch rcr rcw rh- rha rhb rhc rhh rhr rra rrb rrc rrh rrr rwa rwb rwc rwh rwr waa wab wac wah war waw wba wbb wbc wbr wbw wca wcb wcc wch wcr wcw wh- wha whb whc whh whr whw wr- wra wrc wrh wrr wrw wwa wwc www