a-a a-c aaa aac aag aak aas ac- aca acc acg ack acs ag- aga agc agg agk ags aka akc akg akk aks as- asa asc asg ask ass c-- caa cac cag cak cas cca ccc ccg cck ccs cga cgc cgg cgs cka ckc cks csa csc csg csk css gaa gac gag gak gas gca gcc gcg gck gcs gga ggc ggg ggs gka gks gsa gsc gsg gsk gss ka- kaa kac kag kak kas kca kcc kcg kck kcs kga kgc kgs kkc kkk kks ksa ksc ksg ksk kss saa sac sag sak sas sca scc scg sck scs sga sgc sgg sgk sgs sk- ska skc skg skk sks ss- ssa ssc ssg ssk sss