-ic b-u bbb bbc bbd bbe bbi bbs bbt bbu bcb bcc bcd bce bci bcs bct bcu bdb bdc bdd bde bdi bds bdt bdu be- beb bec bed bee bei bes bet beu bi- bib bic bid bie bii bis bit biu bsb bsc bsd bse bsi bss bst bsu btb btc btd bte bti bts btt btu bub buc bud bue bui bus but buu c-- cbb cbc cbd cbe cbi cbs cbt cbu ccb ccc ccd cce cci ccs cct ccu cdb cdc cdd cde cdi cds cdt cdu ce- ceb cec ced cee cei ces cet ceu ci- cib cic cid cie cii cis cit ciu csb csc csd cse csi css cst csu ctb ctc ctd cte cti cts ctt ctu cub cuc cud cue cui cus cut cuu dbb dbc dbd dbe dbi dbs dbt dbu dcb dcc dcd dce dci dcs dct dcu ddb ddc ddd dde ddi dds ddt ddu de- deb dec ded dee dei des det deu di- dib dic did die dii dis dit diu dsb dsc dsd dse dsi dss dst dsu dtb dtc dtd dte dti dts dtt dtu dub duc dud due dui dus dut ebb ebc ebd ebe ebi ebs ebt ebu ec- ecb ecc ecd ece eci ecs ect ecu ed- edb edc edd ede edi eds edt edu eeb eec eed eee ees eet eib eic eid eie eii eis eit eiu es- esb esc esd ese esi ess est esu etb etc etd ete eti ets ett etu eu- eub euc eud eue eui eus eut i-d ibb ibc ibd ibe ibi ibs ibt ibu icb icc icd ice ici ics ict icu idb idc idd ide idi ids idt idu ie- iec ied iee iei ies iet iib iic iid iie iii iis iit iiu is- isb isc isd ise isi iss ist isu itb itc itd ite iti its itt itu iu- iub iuc iud iue iui ius iut sbb sbc sbd sbe sbi sbs sbt sbu scb scc scd sce sci scs sct scu sdb sdc sdd sde sdi sds sdt sdu se- seb sec sed see sei ses set seu sib sic sid sie sii sis sit siu ss- ssb ssc ssd sse ssi sss sst ssu stb stc std ste sti sts stt stu sub suc sud sue sui sus sut suu tbb tbc tbd tbe tbi tbs tbt tbu tcb tcc tcd tce tci tcs tct tcu tdb tdc tdd tde tdi tds tdt tdu te- teb tec ted tee tei tes tet teu tib tic tid tie tii tis tit tiu tsb tsc tsd tse tsi tss tst tsu ttb ttc ttd tte tti tts ttt ttu tub tuc tud tue tui tus tut tuu ubb ubc ube ubi ubs ubt ubu ucb ucc ucd uce uci ucs uct ucu udb udc udd ude udi uds udt udu ueb uec ued uee uei ues uet uib uic uid uie uii uis uit uiu usb usc usd use usi uss ust usu utb utc utd ute uti uts utt utu uuc uue uus uut uuu