(function rhyme(m,e) {

return (function(m,e) {
var i, j, k = e.length; for (i = j = 0; k > 1; i = i === e.length ? 0 : i+1) { if (typeof e[i] === 'undefined') continue; if (j<m) { ++j; } else { --k; j = 0; delete e[i] } };
for (i = 0; i<e.length; ++i) if (typeof e[i] !== 'undefined') return e[i];
throw "not found"
})(m-1,e);

})(2, (function() { var c, s = 'a'.charCodeAt(0), len = 'z'.charCodeAt(0)-s + 1, r=[]; for (c=0; c<len; ++c) r.push(String.fromCharCode(s+c)); return r; })())