code: function add() {
  	var args = [].slice.call(arguments),
  		bits = args.shift().slice();
  	args.forEach(function(arg, y) {
  		var carry = 0,
  			len = arg.length,
  			x,z;
  		for (x=len-1; x>-1; x--) {
  			z = bits[x] + arg[x] + carry;
  			switch (z) {
  				case 3:
  					bits[x] = oneBit;
  					carry = 1;
  					break;
  				case 2:
  					bits[x] = zeroBit;
  					carry = 1;
  					break;
  				case 1:
  					bits[x] = oneBit;
  					carry = 0;
  					break;
  				case 0:
  					bits[x] = zeroBit;
  					carry = 0;
  					break;
  				default:
  					throw new Error(["add",y,x,bits[x],arg[x],carry,z].join(" "));
  					break;
  			}
  		}
  	});
  	return bits;
  }
docs: /* add all arguments (arrays of bits)