a-a a-b a-t aaa aab aae aak aap aat ab- aba abb abe abk abp abt aea aeb aee aek aep aet aka akb ake akk akp ap- apa apb ape apk app apt at- ata atb ate atp att b-p baa bab bae bak bap bat bba bbb bbe bbk bbp bbt be- bea beb bee bek bep bet bka bkb bke bkk bkp bkt bpa bpb bpe bpp bpt bta btb bte btk btp btt eaa eab eae eak eap eat eba ebb ebe ebk ebp ebt eea eeb eee eek eep eet eka ekb eke ekp ekt ep- epa epb epe epp ept eta etb ete etk etp ett k-t ka- kaa kab kae kak kap kat kba kbb kbe kbk kbp ke- kea keb kee kek kep ket kkb kke kkk kkp kkt kpa kpe kpk kpp kpt kta ktb kte ktk ktp ktt p-p paa pab pae pak pap pat pba pbb pbe pbk pbp pbt pea peb pee pek pep pet pka pkb pke pkp pkt ppa ppb ppe ppk ppp ppt pt- pta ptb pte ptk ptp ptt taa tab tae tak tap tat tba tbb tbe tbk tbp tbt te- tea teb tee tek tep tet tka tkb tke tkk tkp tkt tpa tpb tpe tpk tpp tpt tta ttb tte ttk ttp ttt