-er -ic c-- ccc cce cci ccr ccv ccx ce- cec cee cei cer cev cex ci- cic cie cii cir civ cix crc cre cri crr crv crx cvc cve cvi cvr cvv cvx cxc cxi cxr cxv cxx ec- ecc ece eci ecr ecv ecx eec eee eer eev eex eic eie eii eir eiv eix erc ere eri err erv evc eve evi evr evv ex- exc exe exi exr exx i-v icc ice ici icr icv ie- iec iee iei ier iev iex iic iie iii iir iix ir- irc ire iri irr irv irx ivc ive ivi ivr ivv ivx ixc ixe ixi rcc rce rci rcr rcv rcx re- rec ree rei rer rev rex ric rie rii rir riv rix rrc rri rrr rvc rve rvi rvr rvv rxr v-e vcc vce vci vcr vcx vec vee vei ver vex vi- vic vie vii vir viv vix vrc vre vri vrr vvc vvi vvr vvv vxr vxv xci xcr xcv xcx xee xer xev xex xic xie xii xiv xix xrc xrx xvi xxi xxv xxx