-ic a-a a-b a-c a-i aaa aab aac aai aao aar aax ab- aba abb abc abi abo abr abx ac- aca acb acc aci aco acr acx ai- aia aib aic aii aio air aix aoa aob aoc aoi aoo aor aox ar- ara arb arc ari aro arr arx ax- axa axi axo axr axx baa bab bac bai bao bar bax bba bbb bbc bbi bbo bbr bbx bca bcb bcc bci bco bcr bcx bi- bia bib bic bii bio bir bix boa bob boc boi boo bor box bra brb bri bro brr brx bxb bxi bxo bxx c-- caa cab cac cai cao car cax cba cbb cbc cbi cbo cbr cbx cca ccb ccc cci cco ccr ccx ci- cia cib cic cii cio cir cix co- coa cob coc coi coo cor cox cra crb crc cri cro crr crx cxc cxi cxo cxr cxx ia- iaa iab iac iai iao iar iba ibb ibc ibi ibo ibr ibx ica icb icc ici ico icr iia iib iic iii iio iir iix io- ioa iob ioc ioi ioo ior ir- ira irb irc iri iro irr irx ixc ixi o-i oaa oab oac oai oao oar oax ob- oba obb obc obi obo obr obx oc- oca ocb occ oci oco ocr ocx oia oib oic oii oio oir oo- ooa oob ooc ooi ooo oor oox or- ora orb orc ori oro orr orx ox- oxa oxb oxc oxi oxo oxx ra- raa rab rac rai rao rar rax rba rbb rbc rbi rbo rbr rbx rca rcb rcc rci rco rcr rcx ria rib ric rii rio rir rix roa rob roc roi roo ror rox rra rrb rrc rri rrr rxr xaa xac xar xbc xbr xbx xcb xci xcr xcx xia xic xii xio xix xoa xoc xoi xoo xor xox xrc xrx xxi xxo xxx