a-a a-b a-c aaa aab aac aah aan aao aap aar ab- aba abb abc abh abn abo abp abr ac- aca acb acc ach acn aco acp acr aha ahb ahc ahh ahn aho ahp ahr an- ana anb anc anh ann ano anp anr aoa aob aoc aoh aon aoo aop aor ap- apa apb apc aph apn apo app apr ar- ara arb arc arh arn aro arp arr b-p baa bab bac bah ban bao bap bar bba bbb bbc bbh bbn bbo bbp bbr bca bcb bcc bch bcn bco bcp bcr bha bhb bhc bhh bho bhp bhr bna bnb bnc bnn bno bnp bnr boa bob boc boh bon boo bop bor bpa bpb bpc bph bpn bpo bpp bpr bra brb brh brn bro brp brr c-- caa cab cac cah can cao cap car cba cbb cbc cbh cbn cbo cbp cbr cca ccb ccc cch ccn cco ccp ccr ch- cha chb chc chh chn cho chp chr cn- cna cnb cnc cnh cnn cno cnp cnr co- coa cob coc coh con coo cop cor cpa cpb cpc cph cpn cpo cpp cpr cra crb crc crh crn cro crp crr haa hab hac hah han hao hap har hba hbb hbc hbh hbn hbo hbp hbr hca hcb hcc hch hcn hco hcp hcr hha hhb hhc hhh hhn hho hhp hhr hna hnb hnc hnh hnn hno hoa hob hoc hoh hon hoo hop hor hpa hpb hpc hph hpn hpo hpp hpr hr- hra hrb hrc hrh hrn hro hrp hrr naa nab nac nah nan nao nap nar nba nbb nbc nbn nbo nbp nbr nca ncb ncc nch ncn nco ncp ncr nha nhb nhc nhh nhn nhp nhr nna nnb nnc nnh nnn nno nnp no- noa nob noc noh non noo nop nor npa npb npc nph npn npo npp npr nra nrb nrc nrn nro nrp nrr oaa oab oac oah oan oao oap oar ob- oba obb obc obh obn obo obp obr oc- oca ocb occ och ocn oco ocp ocr oha ohc ohh ohn oho ohp ohr on- ona onb onc onh onn ono onp onr oo- ooa oob ooc ooh oon ooo oop oor op- opa opb opc oph opn opo opp opr or- ora orb orc orh orn oro orp orr p-p paa pab pac pah pan pao pap par pba pbb pbc pbn pbo pbp pbr pca pcb pcc pch pcn pco pcp pcr pha phb phc phn pho php phr pn- pna pnb pnc pnh pnn pno pnp pnr poa pob poc poh pon poo pop por ppa ppb ppc pph ppn ppo ppp ppr pra prb prc prh prn pro prp prr ra- raa rab rac rah ran rao rap rar rba rbb rbc rbh rbn rbo rbp rbr rca rcb rcc rch rcn rco rcp rcr rh- rha rhb rhc rhh rhn rho rhp rhr rna rnb rnc rnh rnn rno rnp rnr roa rob roc roh ron roo rop ror rpa rpb rpc rph rpn rpo rpp rpr rra rrb rrc rrh rrn rrp rrr