-er -ic b-u bbb bbc bbe bbi bbo bbr bbu bbx bcb bcc bce bci bco bcr bcu bcx be- beb bec bee bei beo ber beu bex bi- bib bic bie bii bio bir biu bix bob boc boe boi boo bor bou box brb bre bri bro brr bru brx bub buc bue bui buo bur buu bux bxb bxi bxo bxx c-- cbb cbc cbe cbi cbo cbr cbu cbx ccb ccc cce cci cco ccr ccu ccx ce- ceb cec cee cei ceo cer ceu cex ci- cib cic cie cii cio cir ciu cix co- cob coc coe coi coo cor cou cox crb crc cre cri cro crr cru crx cub cuc cue cui cuo cur cuu cxc cxi cxo cxr cxx ebb ebc ebe ebi ebo ebr ebu ebx ec- ecb ecc ece eci eco ecr ecu ecx eeb eec eee eeo eer eex eib eic eie eii eio eir eiu eix eo- eob eoc eoe eoi eoo eor eou erb erc ere eri ero err eru eu- eub euc eue eui eur eux ex- exc exe exi exo exr exu exx ibb ibc ibe ibi ibo ibr ibu ibx icb icc ice ici ico icr icu ie- iec iee iei ier iex iib iic iie iii iio iir iiu iix io- iob ioc ioe ioi ioo ior iou ir- irb irc ire iri iro irr iru irx iu- iub iuc iue iui iur ixc ixe ixi o-i ob- obb obc obe obi obo obr obu obx oc- ocb occ oci oco ocr ocu ocx oeb oec oee oei oeo oer oex oib oic oie oii oio oir oiu oo- oob ooc ooi ooo oor oox or- orb orc ore ori oro orr oru orx ou- ouc oue oui ouo our ox- oxb oxc oxi oxo oxx rbb rbc rbe rbi rbo rbr rbu rbx rcb rcc rce rci rco rcr rcu rcx re- reb rec ree rei reo rer reu rex rib ric rie rii rio rir rix rob roc roe roi roo ror rou rox rrb rrc rri rrr rru rub ruc rue rui ruo rur ruu rux rxr ubb ubc ube ubi ubo ubr ubu ubx ucb ucc uce uci uco ucr ucu ueb uec uee uei uer uib uic uie uii uio uir uiu uob uoc uoe uoo uor uox ur- urb urc ure uri uro urr uru urx uuc uue uur uuu uxb uxc uxo uxr uxu xbc xbe xbr xbx xcb xci xcr xcx xee xer xeu xex xic xie xii xio xiu xix xoc xoi xoo xor xox xrc xrx xue xui xxi xxo xxx