-er -ic a-a a-b a-c a-i aaa aab aac aae aai aao aap aar aax ab- aba abb abc abe abi abo abp abr abx ac- aca acb acc ace aci aco acp acr acx aea aeb aec aee aei aeo aep aer aex ai- aia aib aic aie aii aio aip air aix aoa aob aoc aoe aoi aoo aop aor aox ap- apa apb apc ape api apo app apr apx ar- ara arb arc are ari aro arp arr arx ax- axa axe axi axo axp axr axx b-p baa bab bac bae bai bao bap bar bax bba bbb bbc bbe bbi bbo bbp bbr bbx bca bcb bcc bce bci bco bcp bcr bcx be- bea beb bec bee bei beo bep ber bex bi- bia bib bic bie bii bio bip bir bix boa bob boc boe boi boo bop bor box bpa bpb bpc bpe bpi bpo bpp bpr bpx bra brb bre bri bro brp brr brx bxb bxi bxo bxx c-- caa cab cac cae cai cao cap car cax cba cbb cbc cbe cbi cbo cbp cbr cbx cca ccb ccc cce cci cco ccp ccr ccx ce- cea ceb cec cee cei ceo cep cer cex ci- cia cib cic cie cii cio cip cir cix co- coa cob coc coe coi coo cop cor cox cpa cpb cpc cpe cpi cpo cpp cpr cpx cra crb crc cre cri cro crp crr crx cxc cxi cxo cxp cxr cxx eaa eab eac eae eai eao eap ear eax eba ebb ebc ebe ebi ebo ebp ebr ebx ec- eca ecb ecc ece eci eco ecr ecx eea eeb eec eee eeo eep eer eex eia eib eic eie eii eio eip eir eix eo- eoa eob eoc eoe eoi eoo eop eor ep- epa epb epc epe epi epo epp epr epx era erb erc ere eri ero erp err ex- exa exc exe exi exo exp exr exx ia- iaa iab iac iae iai iao iap iar iba ibb ibc ibe ibi ibo ibp ibr ibx ica icb icc ice ici ico icp icr ie- iea iec iee iei iep ier iex iia iib iic iie iii iio iip iir iix io- ioa iob ioc ioe ioi ioo iop ior ipa ipb ipc ipe ipi ipo ipp ipr ipx ir- ira irb irc ire iri iro irp irr irx ixc ixe ixi o-i oaa oab oac oae oai oao oap oar oax ob- oba obb obc obe obi obo obp obr obx oc- oca ocb occ oci oco ocp ocr ocx oea oeb oec oee oei oeo oep oer oex oia oib oic oie oii oio oip oir oo- ooa oob ooc ooi ooo oop oor oox op- opa opb opc ope opi opo opp opr opx or- ora orb orc ore ori oro orp orr orx ox- oxa oxb oxc oxi oxo oxx p-p paa pab pac pae pai pao pap par pax pba pbb pbc pbe pbi pbo pbp pbr pbx pca pcb pcc pce pci pco pcp pcr pcx pea peb pec pee pei peo pep per pex pia pib pic pie pii pio pip pir pix poa pob poc poe poi poo pop por pox ppa ppb ppc ppe ppi ppo ppp ppr ppx pra prb prc pre pri pro prp prr prx pxc pxe pxr ra- raa rab rac rae rai rao rap rar rax rba rbb rbc rbe rbi rbo rbp rbr rbx rca rcb rcc rce rci rco rcp rcr rcx re- rea reb rec ree rei reo rep rer rex ria rib ric rie rii rio rip rir rix roa rob roc roe roi roo rop ror rox rpa rpb rpc rpe rpi rpo rpp rpr rpx rra rrb rrc rri rrp rrr rxp rxr xaa xac xap xar xbc xbe xbr xbx xcb xci xcp xcr xcx xee xep xer xex xia xic xie xii xio xix xoa xoc xoi xoo xop xor xox xpa xpb xpc xpe xpo xpp xrc xrx xxi xxo xxp xxx