-er a-a a-b aaa aab aae aaj aap aar ab- aba abb abe abj abp abr aea aeb aee aej aep aer aja ajb aje ajj ajp ajr ap- apa apb ape apj app apr ar- ara arb are arj arp arr b-p baa bab bae baj bap bar bba bbb bbe bbp bbr be- bea beb bee bep ber bja bjj bjp bjr bpa bpb bpe bpp bpr bra brb bre brj brp brr eaa eab eae eaj eap ear eba ebb ebe ebj ebp ebr eea eeb eee eep eer eja ejp ep- epa epb epe epp epr era erb ere erp err jaa jab jae jaj jap jar jba jbj jbr jea jeb jee jej jep jer jja jjb jjj jjp jjr jpa jpb jpe jpj jpp jpr jra jrb jrp jrr p-p paa pab pae paj pap par pba pbb pbe pbj pbp pbr pea peb pee pep per pja pjp ppa ppb ppe ppj ppp ppr pra prb pre prp prr ra- raa rab rae raj rap rar rba rbb rbe rbp rbr re- rea reb ree rep rer rja rjp rjr rpa rpb rpe rpp rpr rra rrb rrp rrr