-al a-a a-c a-t aaa aac aal aar aat ac- aca acc acl acr act al- ala alc all alr alt ar- ara arc arl arr art at- ata atc atl atr att c-- caa cac cal car cat cca ccc ccl ccr cct cl- cla clc cll clr clt cra crc crl crr crt cta ctc ctl ctr ctt la- laa lac lal lar lat lca lcc lcl lcr lct lla llc lll llr llt lra lrc lrr lrt lta ltc ltl ltr ltt ra- raa rac ral rar rat rca rcc rcl rcr rct rla rlc rll rlr rlt rra rrc rrl rrr rrt rta rtc rtl rtr rtt taa tac tal tar tat tca tcc tcl tcr tct tla tlc tll tlr tlt tra trc trl trr trt tta ttc ttl ttr ttt