a-a a-b aaa aab aae aaj aao aas ab- aba abb abe abj abo abs aea aeb aee aej aeo aes aja ajb aje ajj ajo ajs aoa aob aoe aoj aoo aos as- asa asb ase asj aso ass baa bab bae baj bao bas bba bbb bbe bbo bbs be- bea beb bee beo bes bja bjj bjs boa bob boe boj boo bos bsa bsb bse bsj bso bss eaa eab eae eaj eao eas eba ebb ebe ebj ebo ebs eea eeb eee eeo ees eja ejo eo- eoa eob eoe eoo eos es- esa esb ese eso ess jaa jab jae jaj jao jas jba jbj jbo jbs jea jeb jee jej jeo jes jja jjb jjj jjs joa job joe joj joo jos jsa jsb jse jsj jso jss oaa oab oae oaj oao oas ob- oba obb obe obj obo obs oea oeb oee oeo oes oja ojb oje ojo ojs oo- ooa oob ooo oos os- osa osb ose osj oso oss saa sab sae saj sao sas sba sbb sbe sbj sbo sbs se- sea seb see sej seo ses sja sjb sje sjj sjs soa sob soe soj soo sos ss- ssa ssb sse ssj sso sss