-er a-a a-b a-z aaa aab aae aap aar aaz ab- aba abb abe abp abr abz aea aeb aee aep aer aez ap- apa apb ape app apr ar- ara arb are arp arr arz az- aza azb aze azp azz b-p baa bab bae bap bar baz bba bbb bbe bbp bbr be- bea beb bee bep ber bez bpa bpb bpe bpp bpr bra brb bre brp brr brz bza bze bzp bzr bzz eaa eab eae eap ear eaz eba ebb ebe ebp ebr eea eeb eee eep eer ep- epa epb epe epp epr epz era erb ere erp err erz eze ezr ezz p-p paa pab pae pap par paz pba pbb pbe pbp pbr pbz pea peb pee pep per pez ppa ppb ppe ppp ppr ppz pra prb pre prp prr prz pzp ra- raa rab rae rap rar raz rba rbb rbe rbp rbr re- rea reb ree rep rer rez rpa rpb rpe rpp rpr rpz rra rrb rrp rrr rza rzb rze zaa zab zap zar zaz zbb zbr zea zeb zee zep zer zez zpe zpp zpr zrp zzr zzz