a-a a-b a-t aaa aab aaj aao aar aat ab- aba abb abj abo abr abt aja ajb ajj ajo ajr ajt aoa aob aoj aoo aor aot ar- ara arb arj aro arr art at- ata atb ato atr att baa bab baj bao bar bat bba bbb bbo bbr bbt bja bjj bjr bjt boa bob boj boo bor bot bra brb brj bro brr brt bta btb bto btr btt jaa jab jaj jao jar jat jba jbj jbo jbr jbt jja jjb jjj jjr joa job joj joo jor jot jra jrb jro jrr jrt jta jtb jtr jtt oaa oab oaj oao oar oat ob- oba obb obj obo obr obt oja ojb ojo oo- ooa oob ooo oor oot or- ora orb oro orr ort ot- ota otb oto otr ott ra- raa rab raj rao rar rat rba rbb rbo rbr rbt rja rjr roa rob roj roo ror rot rra rrb rrr rrt rta rtb rtj rto rtr rtt taa tab taj tao tar tat tba tbb tbj tbo tbr tbt tjo tjr to- toa tob toj too tor tot tra trb tro trr trt tta ttb tto ttr ttt