An anagram generator in JavaScript I set up for possible DNA sequencing patterns

anagramsDNA.js

function allAnagrams(r) {
  var n, a, t, l, e, s;
  if (r.length < 2) {
    return [ r ];
  }
  for (n = [], a = 0; a < r.length; a++) {
    for (t = r[a], l = r.substr(0, a) + r.substr(a + 1, r.length - 1), e = allAnagrams(l), 
    s = 0; s < e.length; s++) {
      n.push(t + e[s]);
    }
  }
  return n;
}

document.write(allAnagrams("ACCGAT"));