a-a a-b a-q aaa aab aan aao aaq aar ab- aba abb abn abo abq abr an- ana anb ann ano anq anr aoa aob aon aoo aor aqa aqn aqo aqr ar- ara arb arn aro arq arr baa bab ban bao baq bar bba bbb bbn bbo bbq bbr bna bnb bnn bno bnr boa bob bon boo boq bor bra brb brn bro brq brr naa nab nan nao nar nba nbb nbn nbo nbr nna nnb nnn nno no- noa nob non noo nor nra nrb nrn nro nrr oaa oab oan oao oaq oar ob- oba obb obn obo obr on- ona onb onn ono onr oo- ooa oob oon ooo oor oqb oqo or- ora orb orn oro orr qaa qan qar qba qbq qnb qoo qor qqq qra qrb ra- raa rab ran rao raq rar rba rbb rbn rbo rbr rna rnb rnn rno rnr roa rob ron roo ror rqn rra rrb rrn rrq rrr