a-a a-b a-c aaa aab aac aah aar aav ab- aba abb abc abh abr abv ac- aca acb acc ach acr acv aha ahb ahc ahh ahr ahv ar- ara arb arc arh arr arv av- ava avb avc avh avr baa bab bac bah bar bav bba bbb bbc bbh bbr bca bcb bcc bch bcr bcv bha bhb bhc bhh bhr bhv bra brb brh brr brv bva bvb bvc bvh bvr bvv c-- caa cab cac cah car cav cba cbb cbc cbh cbr cbv cca ccb ccc cch ccr ccv ch- cha chb chc chh chr chv cra crb crc crh crr crv cva cvb cvc cvh cvr cvv haa hab hac hah har hav hba hbb hbc hbh hbr hbv hca hcb hcc hch hcr hcv hha hhb hhc hhh hhr hhv hr- hra hrb hrc hrh hrr hrv hv- hva hvb hvc hvr hvv ra- raa rab rac rah rar rav rba rbb rbc rbh rbr rca rcb rcc rch rcr rcv rh- rha rhb rhc rhh rhr rhv rra rrb rrc rrh rrr rva rvb rvc rvh rvr rvv v-a vaa vab vac vah var vav vba vbc vbh vbr vbv vca vcc vch vcr vh- vha vhb vhc vra vrb vrc vrh vrr vva vvb vvc vvr vvv