-er -ic bbb bbc bbe bbi bbo bbr bbt bbx bcb bcc bce bci bco bcr bct bcx be- beb bec bee bei beo ber bet bex bi- bib bic bie bii bio bir bit bix bob boc boe boi boo bor bot box brb bre bri bro brr brt brx btb btc bte bti bto btr btt btx bxb bxi bxo bxx c-- cbb cbc cbe cbi cbo cbr cbt cbx ccb ccc cce cci cco ccr cct ccx ce- ceb cec cee cei ceo cer cet cex ci- cib cic cie cii cio cir cit cix co- cob coc coe coi coo cor cot cox crb crc cre cri cro crr crt crx ctb ctc cte cti cto ctr ctt ctx cxc cxi cxo cxr cxt cxx ebb ebc ebe ebi ebo ebr ebt ebx ec- ecb ecc ece eci eco ecr ect ecx eeb eec eee eeo eer eet eex eib eic eie eii eio eir eit eix eo- eob eoc eoe eoi eoo eor eot erb erc ere eri ero err ert etb etc ete eti eto etr ett etx ex- exc exe exi exo exr ext exx ibb ibc ibe ibi ibo ibr ibt ibx icb icc ice ici ico icr ict ie- iec iee iei ier iet iex iib iic iie iii iio iir iit iix io- iob ioc ioe ioi ioo ior iot ir- irb irc ire iri iro irr irt irx itb itc ite iti ito itt itx ixc ixe ixi o-i ob- obb obc obe obi obo obr obt obx oc- ocb occ oci oco ocr oct ocx oeb oec oee oei oeo oer oet oex oib oic oie oii oio oir oit oo- oob ooc ooi ooo oor oot oox or- orb orc ore ori oro orr ort orx ot- otb otc ote oti oto otr ott ox- oxb oxc oxi oxo oxt oxx rbb rbc rbe rbi rbo rbr rbt rbx rcb rcc rce rci rco rcr rct rcx re- reb rec ree rei reo rer ret rex rib ric rie rii rio rir rit rix rob roc roe roi roo ror rot rox rrb rrc rri rrr rrt rtb rtc rte rti rto rtr rtt rtx rxr t-x tbb tbc tbe tbi tbo tbr tbt tcb tcc tce tci tco tcr tct tcx te- teb tec tee tei teo ter tet tex tib tic tie tii tio tir tit tix to- tob toc toe toi too tor tot tox trb trc tre tri tro trr trt trx ttb ttc tte tti tto ttr ttt ttx txe txi txt xbc xbe xbr xbx xcb xci xcr xcx xee xer xet xex xic xie xii xio xit xix xoc xoi xoo xor xot xox xrc xrt xrx xtc xti xtr xtx xxi xxo xxx