ooc oof oog ooi ook ool oon ooo oos oot os- osc ose osf osg osi osk osl osn oso oss ost ot- otc ote otf otg oti otk otl otn oto ots ott scc sce scf scg sci sck scl scn sco scs sct se- sec see sef seg sei sek sel sen seo ses set sfc sfe sff sfg sfi sfk sfl sfn sfo sfs sft sgc sge sgf sgg sgi sgk sgl sgn sgo sgs sgt sic sie sif sig sii sik sil sin sio sis sit sk- skc ske skf skg ski skk skl sko sks skt slc sle slf slg sli slk sll sln slo sls slt snc sne snf sng sni snk snl snn sno sns snt soc soe sof sog soi sok sol son soo sos sot ss- ssc sse ssf ssg ssi ssk ssl ssn sso sss sst stc ste stf stg sti stk stl stn sto sts stt tcc tce tcf tcg tci tck tcl tcn tco tcs tct te- tec tee tef teg tei tek tel ten teo tes tet tfc tfe tff tfg tfi tfk tfl tfn tfo tfs tft tgc tge tgf tgg tgi tgk tgl tgn tgo tgs tgt tic tie tif tig tii tik til tin tio tis tit tkc tke tkg tkk tkl tko tks tkt tlc tle tlf tlg tli tlk tll tln tlo tls tlt tnc tne tnf tng tni tnk tnl tnn tno tns tnt to- toc toe tof tog toi tok tol ton too tos tot tsc tse tsf tsg tsi tsk tsl tsn tso tss tst ttc tte ttf ttg tti ttk ttl ttn tto tts ttt