a-a a-c aaa aac aad aao aap aas ac- aca acc acd aco acp acs ad- ada adc add ado adp ads aoa aoc aod aoo aop aos ap- apa apc apd apo app aps as- asa asc asd aso asp ass c-- caa cac cad cao cap cas cca ccc ccd cco ccp ccs cda cdc cdd cdo cdp cds co- coa coc cod coo cop cos cpa cpc cpd cpo cpp cps csa csc csd cso csp css daa dac dad dao dap das dca dcc dcd dco dcp dcs dda ddc ddd ddo ddp dds doa doc dod doo dop dos dpa dpc dpd dpo dpp dps dsa dsc dsd dso dsp dss oaa oac oad oao oap oas oc- oca occ ocd oco ocp ocs oda odc odd odo odp ods oo- ooa ooc ood ooo oop oos op- opa opc opd opo opp ops os- osa osc osd oso osp oss p-p paa pac pad pao pap pas pca pcc pcd pco pcp pcs pda pdc pdd pdo pdp pds poa poc pod poo pop pos ppa ppc ppd ppo ppp pps ps- psa psc psd pso psp pss saa sac sad sao sap sas sca scc scd sco scp scs sda sdc sdd sdo sdp sds soa soc sod soo sop sos spa spc spd spo spp sps ss- ssa ssc ssd sso ssp sss