-al a-a a-b a-c aaa aab aac aah aal aar ab- aba abb abc abh abl abr ac- aca acb acc ach acl acr aha ahb ahc ahh ahl ahr al- ala alb alc alh all alr ar- ara arb arc arh arl arr baa bab bac bah bal bar bba bbb bbc bbh bbl bbr bca bcb bcc bch bcl bcr bha bhb bhc bhh bhl bhr bla blb blc blh bll blr bra brb brh brl brr c-- caa cab cac cah cal car cba cbb cbc cbh cbl cbr cca ccb ccc cch ccl ccr ch- cha chb chc chh chl chr cl- cla clb clc clh cll clr cra crb crc crh crl crr haa hab hac hah hal har hba hbb hbc hbh hbl hbr hca hcb hcc hch hcl hcr hha hhb hhc hhh hhl hhr hla hlb hlc hlh hll hlr hr- hra hrb hrc hrh hrl hrr la- laa lab lac lah lal lar lba lbb lbc lbh lbl lbr lca lcb lcc lch lcl lcr lha lhb lhc lhh lhr lla llb llc lll llr lra lrb lrc lrh lrr ra- raa rab rac rah ral rar rba rbb rbc rbh rbl rbr rca rcb rcc rch rcl rcr rh- rha rhb rhc rhh rhl rhr rla rlc rlh rll rlr rra rrb rrc rrh rrl rrr