a-a a-b aaa aab aam aar aau aax ab- aba abb abm abr abu abx ama amb amm amr amu amx ar- ara arb arm arr aru arx au- aua aub aum aur aux ax- axa axm axr axx b-u baa bab bam bar bau bax bba bbb bbm bbr bbu bbx bma bmb bmm bmr bmu bmx bra brb brm brr bru brx bua bub bum bur buu bux bxb bxm bxx m-r maa mab mam mar mau max mba mbb mbm mbr mbu mbx mma mmb mmm mmr mmu mmx mra mrb mrm mrr mru mrx mua mub mum mur muu mux mxa mxr mxu ra- raa rab ram rar rau rax rba rbb rbm rbr rbu rbx rma rmb rmm rmr rmx rra rrb rrm rrr rru rua rub rum rur ruu rux rxr ua- uaa uab uam uar uau uba ubb ubr ubu ubx um- uma umb umm umr umu ur- ura urb urm urr uru urx uua uum uur uuu uxb uxr uxu xaa xam xar xau xbr xbx xma xmm xmr xmu xmx xrx xxx