-ic a-a a-b a-c a-i aaa aab aac aai aao aap aar aax ab- aba abb abc abi abo abp abr abx ac- aca acb acc aci aco acp acr acx ai- aia aib aic aii aio aip air aix aoa aob aoc aoi aoo aop aor aox ap- apa apb apc api apo app apr apx ar- ara arb arc ari aro arp arr arx ax- axa axi axo axp axr axx b-p baa bab bac bai bao bap bar bax bba bbb bbc bbi bbo bbp bbr bbx bca bcb bcc bci bco bcp bcr bcx bi- bia bib bic bii bio bip bir bix boa bob boc boi boo bop bor box bpa bpb bpc bpi bpo bpp bpr bpx bra brb bri bro brp brr brx bxb bxi bxo bxx c-- caa cab cac cai cao cap car cax cba cbb cbc cbi cbo cbp cbr cbx cca ccb ccc cci cco ccp ccr ccx ci- cia cib cic cii cio cip cir cix co- coa cob coc coi coo cop cor cox cpa cpb cpc cpi cpo cpp cpr cpx cra crb crc cri cro crp crr crx cxc cxi cxo cxp cxr cxx ia- iaa iab iac iai iao iap iar iba ibb ibc ibi ibo ibp ibr ibx ica icb icc ici ico icp icr iia iib iic iii iio iip iir iix io- ioa iob ioc ioi ioo iop ior ipa ipb ipc ipi ipo ipp ipr ipx ir- ira irb irc iri iro irp irr irx ixc ixi o-i oaa oab oac oai oao oap oar oax ob- oba obb obc obi obo obp obr obx oc- oca ocb occ oci oco ocp ocr ocx oia oib oic oii oio oip oir oo- ooa oob ooc ooi ooo oop oor oox op- opa opb opc opi opo opp opr opx or- ora orb orc ori oro orp orr orx ox- oxa oxb oxc oxi oxo oxx p-p paa pab pac pai pao pap par pax pba pbb pbc pbi pbo pbp pbr pbx pca pcb pcc pci pco pcp pcr pcx pia pib pic pii pio pip pir pix poa pob poc poi poo pop por pox ppa ppb ppc ppi ppo ppp ppr ppx pra prb prc pri pro prp prr prx pxc pxr ra- raa rab rac rai rao rap rar rax rba rbb rbc rbi rbo rbp rbr rbx rca rcb rcc rci rco rcp rcr rcx ria rib ric rii rio rip rir rix roa rob roc roi roo rop ror rox rpa rpb rpc rpi rpo rpp rpr rpx rra rrb rrc rri rrp rrr rxp rxr xaa xac xap xar xbc xbr xbx xcb xci xcp xcr xcx xia xic xii xio xix xoa xoc xoi xoo xop xor xox xpa xpb xpc xpo xpp xrc xrx xxi xxo xxp xxx