a-a a-c aaa aac aad aao aar aas ac- aca acc acd aco acr acs ad- ada adc add ado adr ads aoa aoc aod aoo aor aos ar- ara arc ard aro arr ars as- asa asc asd aso asr ass c-- caa cac cad cao car cas cca ccc ccd cco ccr ccs cda cdc cdd cdo cdr cds co- coa coc cod coo cor cos cra crc crd cro crr crs csa csc csd cso csr css daa dac dad dao dar das dca dcc dcd dco dcr dcs dda ddc ddd ddo ddr dds doa doc dod doo dor dos dra drc drd dro drr drs dsa dsc dsd dso dsr dss oaa oac oad oao oar oas oc- oca occ ocd oco ocr ocs oda odc odd odo odr ods oo- ooa ooc ood ooo oor oos or- ora orc ord oro orr ors os- osa osc osd oso osr oss ra- raa rac rad rao rar ras rca rcc rcd rco rcr rcs rda rdc rdd rdo rdr rds roa roc rod roo ror ros rra rrc rrd rrr rrs rsa rsc rsd rso rsr rss saa sac sad sao sar sas sca scc scd sco scr scs sda sdc sdd sdo sdr sds soa soc sod soo sor sos sr- sra src srd sro srr srs ss- ssa ssc ssd sso ssr sss