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function _uHash(d) {
 if (!d || d=="") return 1;
 var h=0,g=0;
 for (var i=d.length-1;i>=0;i--) {
  var c=parseInt(d.charCodeAt(i));
  h=((h << 6) & 0xfffffff) + c + (c << 14);
  if ((g=h & 0xfe00000)!=0) h=(h ^ (g >> 21));
 }
 return h;
}