-er -ic c-- ccc cce cci ccr ccu ccx ce- cec cee cei cer ceu cex ci- cic cie cii cir ciu cix crc cre cri crr cru crx cuc cue cui cur cuu cxc cxi cxr cxx ec- ecc ece eci ecr ecu ecx eec eee eer eex eic eie eii eir eiu eix erc ere eri err eru eu- euc eue eui eur eux ex- exc exe exi exr exu exx icc ice ici icr icu ie- iec iee iei ier iex iic iie iii iir iiu iix ir- irc ire iri irr iru irx iu- iuc iue iui iur ixc ixe ixi rcc rce rci rcr rcu rcx re- rec ree rei rer reu rex ric rie rii rir rix rrc rri rrr rru ruc rue rui rur ruu rux rxr ucc uce uci ucr ucu uec uee uei uer uic uie uii uir uiu ur- urc ure uri urr uru urx uuc uue uur uuu uxc uxr uxu xci xcr xcx xee xer xeu xex xic xie xii xiu xix xrc xrx xue xui xxi xxx