c-- ccc ccr ccs cct ccv crc crr crs crt crv csc csr css cst csv ctc ctr cts ctt ctv cvc cvr cvs cvt cvv rcc rcr rcs rct rcv rrc rrr rrs rrt rsc rsr rss rst rsv rtc rtr rts rtt rtv rvc rvr rvs rvt rvv scc scr scs sct scv sr- src srr srs srt srv ss- ssc ssr sss sst ssv stc str sts stt stv svc svr svs svt svv tcc tcr tcs tct tcv trc trr trs trt trv tsc tsr tss tst tsv ttc ttr tts ttt ttv tvc tvr tvs tvt vcc vcr vcs vct vrc vrr vrs vrt vsc vsr vss vst vsv vtc vtr vts vtt vtv vvc vvr vvs vvt vvv