-er a-a a-b a-c aaa aab aac aae aah aaj aao aar aas ab- aba abb abc abe abh abj abo abr abs ac- aca acb acc ace ach acj aco acr acs aea aeb aec aee aeh aej aeo aer aes aha ahb ahc ahe ahh ahj aho ahr ahs aja ajb ajc aje ajh ajj ajo ajr ajs aoa aob aoc aoe aoh aoj aoo aor aos ar- ara arb arc are arh arj aro arr ars as- asa asb asc ase ash asj aso asr ass baa bab bac bae bah baj bao bar bas bba bbb bbc bbe bbh bbo bbr bbs bca bcb bcc bce bch bcj bco bcr bcs be- bea beb bec bee beh beo ber bes bha bhb bhc bhe bhh bhj bho bhr bhs bja bjc bjj bjr bjs boa bob boc boe boh boj boo bor bos bra brb bre brh brj bro brr brs bsa bsb bsc bse bsh bsj bso bsr bss c-- c-j caa cab cac cae cah caj cao car cas cba cbb cbc cbe cbh cbj cbo cbr cbs cca ccb ccc cce cch ccj cco ccr ccs ce- cea ceb cec cee ceh cej ceo cer ces ch- cha chb chc che chh cho chr chs cja cjb cjc cjr cjs co- coa cob coc coe coh coj coo cor cos cra crb crc cre crh crj cro crr crs csa csb csc cse csh csj cso csr css eaa eab eac eae eah eaj eao ear eas eba ebb ebc ebe ebh ebj ebo ebr ebs ec- eca ecb ecc ece ech ecj eco ecr ecs eea eeb eec eee eeo eer ees eha ehb ehc ehe ehh eho ehr ehs eja ejc ejo eo- eoa eob eoc eoe eoh eoo eor eos era erb erc ere erh ero err ers es- esa esb esc ese esh eso esr ess haa hab hac hae hah haj hao har has hba hbb hbc hbe hbh hbj hbo hbr hbs hca hcb hcc hce hch hcj hco hcr hcs he- hea heb hec hee heh hej heo her hes hha hhb hhc hhe hhh hhj hho hhr hhs hja hjo hjr hjs hoa hob hoc hoe hoh hoo hor hos hr- hra hrb hrc hre hrh hrj hro hrr hrs hsa hsb hsc hse hsh hsj hsr hss jaa jab jac jae jah jaj jao jar jas jba jbc jbj jbo jbr jbs jca jcb jcc jce jch jco jcr jcs jea jeb jec jee jeh jej jeo jer jes jha jhc jhe jhj jho jhr jhs jja jjb jjc jjj jjr jjs joa job joc joe joh joj joo jor jos jra jrb jrc jro jrr jrs jsa jsb jsc jse jsh jsj jso jsr jss oaa oab oac oae oah oaj oao oar oas ob- oba obb obc obe obh obj obo obr obs oc- oca ocb occ och ocj oco ocr ocs oea oeb oec oee oeh oeo oer oes oha ohc ohe ohh oho ohr ohs oja ojb ojc oje ojo ojs oo- ooa oob ooc ooh ooo oor oos or- ora orb orc ore orh oro orr ors os- osa osb osc ose osh osj oso osr oss ra- raa rab rac rae rah raj rao rar ras rba rbb rbc rbe rbh rbo rbr rbs rca rcb rcc rce rch rcj rco rcr rcs re- rea reb rec ree reh reo rer res rh- rha rhb rhc rhe rhh rho rhr rhs rja rjc rjr roa rob roc roe roh roj roo ror ros rra rrb rrc rrh rrr rrs rsa rsb rsc rse rsh rsj rso rsr rss saa sab sac sae sah saj sao sar sas sba sbb sbc sbe sbh sbj sbo sbr sbs sca scb scc sce sch scj sco scr scs se- sea seb sec see seh sej seo ser ses sh- sha shb shc she shh sho shr shs sja sjb sjc sje sjh sjj sjr sjs soa sob soc soe soh soj soo sor sos sr- sra srb src sre srh srj sro srr srs ss- ssa ssb ssc sse ssh ssj sso ssr sss