-er a-a a-c a-t a-z aaa aac aae aap aar aat aaz ac- aca acc ace acp acr act acz aea aec aee aep aer aet aez ap- apa apc ape app apr apt ar- ara arc are arp arr art arz at- ata atc ate atp atr att atz az- aza aze azp azt azz c-- caa cac cae cap car cat caz cca ccc cce ccp ccr cct ccz ce- cea cec cee cep cer cet cez cpa cpc cpe cpp cpr cpt cpz cra crc cre crp crr crt crz cta ctc cte ctp ctr ctt ctz cz- czc cze czt eaa eac eae eap ear eat eaz ec- eca ecc ece ecr ect eea eec eee eep eer eet ep- epa epc epe epp epr ept epz era erc ere erp err ert erz eta etc ete etp etr ett etz eze ezr ezz p-p paa pac pae pap par pat paz pca pcc pce pcp pcr pct pea pec pee pep per pet pez ppa ppc ppe ppp ppr ppt ppz pra prc pre prp prr prt prz pt- pta ptc pte ptp ptr ptt ptz pzc pzp pzt ra- raa rac rae rap rar rat raz rca rcc rce rcp rcr rct re- rea rec ree rep rer ret rez rpa rpc rpe rpp rpr rpt rpz rra rrc rrp rrr rrt rta rtc rte rtp rtr rtt rtz rza rze taa tac tae tap tar tat taz tca tcc tce tcp tcr tct te- tea tec tee tep ter tet tez tpa tpc tpe tpp tpr tpt tpz tra trc tre trp trr trt trz tta ttc tte ttp ttr ttt tza tze zaa zac zap zar zat zaz zce zea zec zee zep zer zet zez zpc zpe zpp zpr zpt zrp zta zte ztr zzr zzt zzz