a-a a-b a-q aaa aab aan aao aap aaq aar ab- aba abb abn abo abp abq abr an- ana anb ann ano anp anq anr aoa aob aon aoo aop aor ap- apa apb apn apo app apq apr aqa aqn aqo aqp aqr ar- ara arb arn aro arp arq arr b-p baa bab ban bao bap baq bar bba bbb bbn bbo bbp bbq bbr bna bnb bnn bno bnp bnr boa bob bon boo bop boq bor bpa bpb bpn bpo bpp bpr bqp bra brb brn bro brp brq brr naa nab nan nao nap nar nba nbb nbn nbo nbp nbr nna nnb nnn nno nnp no- noa nob non noo nop nor npa npb npn npo npp npr nra nrb nrn nro nrp nrr oaa oab oan oao oap oaq oar ob- oba obb obn obo obp obr on- ona onb onn ono onp onr oo- ooa oob oon ooo oop oor op- opa opb opn opo opp opq opr oqb oqo or- ora orb orn oro orp orr p-p paa pab pan pao pap paq par pba pbb pbn pbo pbp pbr pn- pna pnb pnn pno pnp pnr poa pob pon poo pop por ppa ppb ppn ppo ppp ppq ppr pqq pqr pra prb prn pro prp prq prr qaa qan qap qar qba qbq qnb qoo qop qor qpp qpr qqq qra qrb qrp ra- raa rab ran rao rap raq rar rba rbb rbn rbo rbp rbr rna rnb rnn rno rnp rnr roa rob ron roo rop ror rpa rpb rpn rpo rpp rpr rqn rra rrb rrn rrp rrq rrr