-up a-a a-b aaa aab aap aar aas aau ab- aba abb abp abr abs abu ap- apa apb app apr aps apu ar- ara arb arp arr ars aru as- asa asb asp asr ass asu au- aua aub aup aur aus b-p b-u baa bab bap bar bas bau bba bbb bbp bbr bbs bbu bpa bpb bpp bpr bps bpu bra brb brp brr brs bru bsa bsb bsp bsr bss bsu bua bub bup bur bus buu p-p paa pab pap par pas pau pba pbb pbp pbr pbs pbu ppa ppb ppp ppr pps ppu pra prb prp prr prs pru ps- psa psb psp psr pss psu pua pub pup pur pus puu ra- raa rab rap rar ras rau rba rbb rbp rbr rbs rbu rpa rpb rpp rpr rps rpu rra rrb rrp rrr rrs rru rsa rsb rsp rsr rss rsu rua rub rup rur rus ruu saa sab sap sar sas sau sba sbb sbp sbr sbs sbu spa spb spp spr sps spu sr- sra srb srp srr srs ss- ssa ssb ssp ssr sss ssu sua sub sup sur sus suu ua- uaa uab uap uar uas uau uba ubb ubp ubr ubs ubu up- upa upb upp upr ups upu ur- ura urb urp urr urs uru usa usb usp usr uss usu uua uur uus uuu