-er a-a a-b a-c a-q aaa aab aac aae aag aaq aar aau ab- aba abb abc abe abg abq abr abu ac- aca acb acc ace acg acq acr acu aea aeb aec aee aeg aeq aer aeu ag- aga agb agc age agg agq agr agu aqa aqc aqr ar- ara arb arc are arg arq arr aru au- aua aub auc aue aug aur b-u baa bab bac bae bag baq bar bau bba bbb bbc bbe bbg bbq bbr bbu bca bcb bcc bce bcg bcq bcr bcu be- bea beb bec bee beg beq ber beu bga bgb bgc bge bgg bgr bgu bqc bqe bra brb bre brg brq brr bru bua bub buc bue bug bur buu c-- caa cab cac cae cag caq car cau cba cbb cbc cbe cbg cbq cbr cbu cca ccb ccc cce ccg ccr ccu ce- cea ceb cec cee ceg ceq cer ceu cga cgb cgc cge cgg cgr cgu cqa cqb cqc cqg cra crb crc cre crg crq crr cru cua cub cuc cue cug cuq cur cuu eaa eab eac eae eag ear eau eba ebb ebc ebe ebg ebq ebr ebu ec- eca ecb ecc ece ecg ecq ecr ecu eea eeb eec eee eeg eer ega egb egc ege egg egr egu eqa eqe eqq equ era erb erc ere erg erq err eru eu- eua eub euc eue eug eur gaa gab gac gae gag gar gau gba gbc gbe gbg gbr gbu gca gcb gcc gce gcg gcr gcu ge- gea geb gec gee geg ger geu gga ggb ggc ggg ggr ggu gra grb grc gre grg grq grr gru gu- gua gub guc gue gug gur guu qaa qac qag qar qau qba qbc qbe qbq qca qcc qec qee qga qgc qqq qqu qra qrb qrc qre qrg qru qu- qua que qur ra- raa rab rac rae rag raq rar rau rba rbb rbc rbe rbg rbr rbu rca rcb rcc rce rcg rcr rcu re- rea reb rec ree reg req rer reu rga rgb rgc rge rgg rgr rqc rra rrb rrc rrg rrq rrr rru rua rub ruc rue rug rur ruu ua- uaa uab uac uae uag uaq uar uau uba ubb ubc ube ubg ubr ubu uca ucb ucc uce ucg ucr ucu uea ueb uec uee ueg uer uga ugb ugc uge ugg ugr ugu ur- ura urb urc ure urg urr uru uua uuc uue uug uur uuu