a-a a-b aaa aab aah aap aar ab- aba abb abh abp abr aha ahb ahh ahp ahr ap- apa apb aph app apr ar- ara arb arh arp arr b-p baa bab bah bap bar bba bbb bbh bbp bbr bha bhb bhh bhp bhr bpa bpb bph bpp bpr bra brb brh brp brr haa hab hah hap har hba hbb hbh hbp hbr hha hhb hhh hhp hhr hpa hpb hph hpp hpr hr- hra hrb hrh hrp hrr p-p paa pab pah pap par pba pbb pbp pbr pha phb php phr ppa ppb pph ppp ppr pra prb prh prp prr ra- raa rab rah rap rar rba rbb rbh rbp rbr rh- rha rhb rhh rhp rhr rpa rpb rph rpp rpr rra rrb rrh rrp rrr