a-a a-b a-c aaa aab aac aad aah aan aao aap aar ab- aba abb abc abd abh abn abo abp abr ac- aca acb acc acd ach acn aco acp acr ad- ada adb adc add adh adn ado adp adr aha ahb ahc ahd ahh ahn aho ahp ahr an- ana anb anc and anh ann ano anp anr aoa aob aoc aod aoh aon aoo aop aor ap- apa apb apc apd aph apn apo app apr ar- ara arb arc ard arh arn aro arp arr b-p baa bab bac bad bah ban bao bap bar bba bbb bbc bbd bbh bbn bbo bbp bbr bca bcb bcc bcd bch bcn bco bcp bcr bda bdb bdc bdd bdh bdo bdp bdr bha bhb bhc bhd bhh bho bhp bhr bna bnb bnc bnd bnn bno bnp bnr boa bob boc bod boh bon boo bop bor bpa bpb bpc bpd bph bpn bpo bpp bpr bra brb brd brh brn bro brp brr c-- caa cab cac cad cah can cao cap car cba cbb cbc cbd cbh cbn cbo cbp cbr cca ccb ccc ccd cch ccn cco ccp ccr cda cdb cdc cdd cdh cdn cdo cdp cdr ch- cha chb chc chd chh chn cho chp chr cn- cna cnb cnc cnd cnh cnn cno cnp cnr co- coa cob coc cod coh con coo cop cor cpa cpb cpc cpd cph cpn cpo cpp cpr cra crb crc crd crh crn cro crp crr daa dab dac dad dah dan dao dap dar dba dbb dbc dbd dbh dbn dbo dbp dbr dca dcb dcc dcd dcn dco dcp dcr dda ddb ddc ddd ddh ddn ddo ddp ddr dh- dha dhb dhc dhd dhh dho dhp dhr dna dnb dnc dnd dnh dnn dno dnp dnr doa dob doc dod doh don doo dop dor dpa dpb dpc dpd dph dpn dpo dpp dpr dra drb drc drd drn dro drp drr haa hab hac had hah han hao hap har hba hbb hbc hbd hbh hbn hbo hbp hbr hca hcb hcc hcd hch hcn hco hcp hcr hda hdb hdc hdd hdh hdn hdo hdp hdr hha hhb hhc hhd hhh hhn hho hhp hhr hna hnb hnc hnd hnh hnn hno hoa hob hoc hod hoh hon hoo hop hor hpa hpb hpc hpd hph hpn hpo hpp hpr hr- hra hrb hrc hrd hrh hrn hro hrp hrr naa nab nac nad nah nan nao nap nar nba nbb nbc nbd nbn nbo nbp nbr nca ncb ncc ncd nch ncn nco ncp ncr nda ndb ndc ndd ndh ndn ndo ndp ndr nha nhb nhc nhd nhh nhn nhp nhr nna nnb nnc nnh nnn nno nnp no- noa nob noc nod noh non noo nop nor npa npb npc npd nph npn npo npp npr nra nrb nrc nrd nrn nro nrp nrr oaa oab oac oad oah oan oao oap oar ob- oba obb obc obd obh obn obo obp obr oc- oca ocb occ ocd och ocn oco ocp ocr oda odb odc odd odh odn odo odp odr oha ohc ohd ohh ohn oho ohp ohr on- ona onb onc ond onh onn ono onp onr oo- ooa oob ooc ood ooh oon ooo oop oor op- opa opb opc opd oph opn opo opp opr or- ora orb orc ord orh orn oro orp orr p-p paa pab pac pad pah pan pao pap par pba pbb pbc pbd pbn pbo pbp pbr pca pcb pcc pcd pch pcn pco pcp pcr pda pdb pdc pdd pdh pdn pdo pdp pdr pha phb phc phd phn pho php phr pn- pna pnb pnc pnd pnh pnn pno pnp pnr poa pob poc pod poh pon poo pop por ppa ppb ppc ppd pph ppn ppo ppp ppr pra prb prc prd prh prn pro prp prr ra- raa rab rac rad rah ran rao rap rar rba rbb rbc rbd rbh rbn rbo rbp rbr rca rcb rcc rcd rch rcn rco rcp rcr rda rdb rdc rdd rdh rdn rdo rdp rdr rh- rha rhb rhc rhd rhh rhn rho rhp rhr rna rnb rnc rnd rnh rnn rno rnp rnr roa rob roc rod roh ron roo rop ror rpa rpb rpc rpd rph rpn rpo rpp rpr rra rrb rrc rrd rrh rrn rrp rrr