a-a a-c aaa aac aad aao aar aax ac- aca acc acd aco acr acx ad- ada adc add ado adr adx aoa aoc aod aoo aor aox ar- ara arc ard aro arr arx ax- axa axo axr axx c-- caa cac cad cao car cax cca ccc ccd cco ccr ccx cda cdc cdd cdo cdr cdx co- coa coc cod coo cor cox cra crc crd cro crr crx cxc cxo cxr cxx daa dac dad dao dar dax dca dcc dcd dco dcr dcx dda ddc ddd ddo ddr ddx doa doc dod doo dor dox dra drc drd dro drr drx dxc dxd dxo dxr dxx oaa oac oad oao oar oax oc- oca occ ocd oco ocr ocx oda odc odd odo odr oo- ooa ooc ood ooo oor oox or- ora orc ord oro orr orx ox- oxa oxc oxo oxx ra- raa rac rad rao rar rax rca rcc rcd rco rcr rcx rda rdc rdd rdo rdr rdx roa roc rod roo ror rox rra rrc rrd rrr rxr xaa xac xad xar xcd xcr xcx xda xdc xdr xoa xoc xod xoo xor xox xrc xrd xrx xxo xxx