a-a a-c aaa aac aad aap aas ac- aca acc acd acp acs ad- ada adc add adp ads ap- apa apc apd app aps as- asa asc asd asp ass c-- caa cac cad cap cas cca ccc ccd ccp ccs cda cdc cdd cdp cds cpa cpc cpd cpp cps csa csc csd csp css daa dac dad dap das dca dcc dcd dcp dcs dda ddc ddd ddp dds dpa dpc dpd dpp dps dsa dsc dsd dsp dss p-p paa pac pad pap pas pca pcc pcd pcp pcs pda pdc pdd pdp pds ppa ppc ppd ppp pps ps- psa psc psd psp pss saa sac sad sap sas sca scc scd scp scs sda sdc sdd sdp sds spa spc spd spp sps ss- ssa ssc ssd ssp sss