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d3.min = function(array, f) {
  var i = -1,
      n = array.length,
      a,
      b;
  if (arguments.length === 1) {
    while (++i < n) if ((b = array[i]) != null && b >= b) { a = b; break; }
    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
  } else {
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b >= b) { a = b; break; }
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
  }
  return a;
};