a-a a-b a-i aaa aab aad aaf aai aas aau ab- aba abb abd abf abi abs abu ad- ada adb add adf adi ads adu af- afa afb afd aff afi afs afu ai- aia aib aid aif aii ais aiu as- asa asb asd asf asi ass asu au- aua aub aud auf aui aus b-u baa bab bad baf bai bas bau bba bbb bbd bbf bbi bbs bbu bda bdb bdd bdf bdi bds bdu bfa bfb bfd bff bfi bfs bfu bi- bia bib bid bif bii bis biu bsa bsb bsd bsf bsi bss bsu bua bub bud buf bui bus buu daa dab dad daf dai das dau dba dbb dbd dbf dbi dbs dbu dda ddb ddd ddf ddi dds ddu dfa dfb dfd dff dfi dfs dfu di- dia dib did dif dii dis diu dsa dsb dsd dsf dsi dss dsu dua dub dud duf dui dus faa fab fad faf fai fas fau fba fbb fbd fbf fbi fbs fbu fda fdb fdd fdf fdi fds fdu ffa ffd fff ffi ffs ffu fia fib fid fif fii fis fiu fsa fsb fsd fsf fsi fss fsu fua fub fud fuf fui fus fuu i-d i-f ia- iaa iab iad iaf iai ias iau iba ibb ibd ibf ibi ibs ibu ida idb idd idf idi ids idu ifa ifb ifd iff ifi ifs ifu iia iib iid iif iii iis iiu is- isa isb isd isf isi iss isu iu- iua iub iud iui ius saa sab sad saf sai sas sau sba sbb sbd sbf sbi sbs sbu sda sdb sdd sdf sdi sds sdu sfa sfb sfd sff sfi sfs sfu sia sib sid sif sii sis siu ss- ssa ssb ssd ssf ssi sss ssu sua sub sud suf sui sus suu ua- uaa uab uad uaf uai uas uau uba ubb ubf ubi ubs ubu uda udb udd udf udi uds udu ufa ufd uff ufi ufs ufu uia uib uid uif uii uis uiu usa usb usd usf usi uss usu uua uus uuu