a-a a-b a-t aaa aab aan aao aap aas aat ab- aba abb abn abo abp abs abt an- ana anb ann ano anp ans ant aoa aob aon aoo aop aos aot ap- apa apb apn apo app aps apt as- asa asb asn aso asp ass ast at- ata atb atn ato atp ats att b-p baa bab ban bao bap bas bat bba bbb bbn bbo bbp bbs bbt bna bnb bnn bno bnp bns bnt boa bob bon boo bop bos bot bpa bpb bpn bpo bpp bps bpt bsa bsb bsn bso bsp bss bst bta btb btn bto btp bts btt naa nab nan nao nap nas nat nba nbb nbn nbo nbp nbs nbt nna nnb nnn nno nnp nns nnt no- noa nob non noo nop nos not npa npb npn npo npp nps npt nsa nsb nsn nso nsp nss nst nta ntb ntn nto ntp nts ntt oaa oab oan oao oap oas oat ob- oba obb obn obo obp obs obt on- ona onb onn ono onp ons ont oo- ooa oob oon ooo oop oos oot op- opa opb opn opo opp ops opt os- osa osb osn oso osp oss ost ot- ota otb otn oto otp ots ott p-p paa pab pan pao pap pas pat pba pbb pbn pbo pbp pbs pbt pn- pna pnb pnn pno pnp pns pnt poa pob pon poo pop pos pot ppa ppb ppn ppo ppp pps ppt ps- psa psb psn pso psp pss pst pt- pta ptb ptn pto ptp pts ptt saa sab san sao sap sas sat sba sbb sbn sbo sbp sbs sbt sna snb snn sno snp sns snt soa sob son soo sop sos sot spa spb spn spo spp sps spt ss- ssa ssb ssn sso ssp sss sst sta stb stn sto stp sts stt taa tab tan tao tap tas tat tba tbb tbn tbo tbp tbs tbt tna tnb tnn tno tnp tns tnt to- toa tob ton too top tos tot tpa tpb tpn tpo tpp tps tpt tsa tsb tsn tso tsp tss tst tta ttb ttn tto ttp tts ttt