-ic b-u bbb bbc bbi bbr bbs bbt bbu bbx bcb bcc bci bcr bcs bct bcu bcx bi- bib bic bii bir bis bit biu bix brb bri brr brs brt bru brx bsb bsc bsi bsr bss bst bsu bsx btb btc bti btr bts btt btu btx bub buc bui bur bus but buu bux bxb bxi bxx c-- cbb cbc cbi cbr cbs cbt cbu cbx ccb ccc cci ccr ccs cct ccu ccx ci- cib cic cii cir cis cit ciu cix crb crc cri crr crs crt cru crx csb csc csi csr css cst csu csx ctb ctc cti ctr cts ctt ctu ctx cub cuc cui cur cus cut cuu cxc cxi cxr cxs cxt cxx ibb ibc ibi ibr ibs ibt ibu ibx icb icc ici icr ics ict icu iib iic iii iir iis iit iiu iix ir- irb irc iri irr irs irt iru irx is- isb isc isi isr iss ist isu itb itc iti its itt itu itx iu- iub iuc iui iur ius iut ixc ixi rbb rbc rbi rbr rbs rbt rbu rbx rcb rcc rci rcr rcs rct rcu rcx rib ric rii rir ris rit rix rrb rrc rri rrr rrs rrt rru rsb rsc rsi rsr rss rst rsu rsx rtb rtc rti rtr rts rtt rtu rtx rub ruc rui rur rus rut ruu rux rxr rxs sbb sbc sbi sbr sbs sbt sbu sbx scb scc sci scr scs sct scu scx sib sic sii sir sis sit siu six sr- srb src sri srr srs srt srx ss- ssb ssc ssi ssr sss sst ssu ssx stb stc sti str sts stt stu stx sub suc sui sur sus sut suu sux sxc sxi sxs sxt sxu t-x tbb tbc tbi tbr tbs tbt tbu tcb tcc tci tcr tcs tct tcu tcx tib tic tii tir tis tit tiu tix trb trc tri trr trs trt tru trx tsb tsc tsi tsr tss tst tsu tsx ttb ttc tti ttr tts ttt ttu ttx tub tuc tui tur tus tut tuu tux txi txs txt txu ubb ubc ubi ubr ubs ubt ubu ubx ucb ucc uci ucr ucs uct ucu uib uic uii uir uis uit uiu ur- urb urc uri urr urs urt uru urx usb usc usi usr uss ust usu usx utb utc uti utr uts utt utu utx uuc uur uus uut uuu uxb uxc uxr uxt uxu xbc xbr xbx xcb xci xcr xcx xic xii xis xit xiu xix xrc xrt xrx xsb xsc xsi xss xst xtc xti xtr xts xtx xui xus xxi xxx