-ic a-a a-c a-i aaa aac aae aai aao aap aax ac- aca acc ace aci aco acp acx aea aec aee aei aeo aep aex ai- aia aic aie aii aio aip aix aoa aoc aoe aoi aoo aop aox ap- apa apc ape api apo app apx ax- axa axe axi axo axp axx c-- caa cac cae cai cao cap cax cca ccc cce cci cco ccp ccx ce- cea cec cee cei ceo cep cex ci- cia cic cie cii cio cip cix co- coa coc coe coi coo cop cox cpa cpc cpe cpi cpo cpp cpx cxc cxi cxo cxp cxx eaa eac eae eai eao eap eax ec- eca ecc ece eci eco ecx eea eec eee eeo eep eex eia eic eie eii eio eip eix eo- eoa eoc eoe eoi eoo eop ep- epa epc epe epi epo epp epx ex- exa exc exe exi exo exp exx ia- iaa iac iae iai iao iap ica icc ice ici ico icp ie- iea iec iee iei iep iex iia iic iie iii iio iip iix io- ioa ioc ioe ioi ioo iop ipa ipc ipe ipi ipo ipp ipx ixc ixe ixi o-i oaa oac oae oai oao oap oax oc- oca occ oci oco ocp ocx oea oec oee oei oeo oep oex oia oic oie oii oio oip oo- ooa ooc ooi ooo oop oox op- opa opc ope opi opo opp opx ox- oxa oxc oxi oxo oxx p-p paa pac pae pai pao pap pax pca pcc pce pci pco pcp pcx pea pec pee pei peo pep pex pia pic pie pii pio pip pix poa poc poe poi poo pop pox ppa ppc ppe ppi ppo ppp ppx pxc pxe xaa xac xap xci xcp xcx xee xep xex xia xic xie xii xio xix xoa xoc xoi xoo xop xox xpa xpc xpe xpo xpp xxi xxo xxp xxx