function subtract_array(a_array, b_array) {
var my_result, tmp_f, i, ii;
my_result = new Array();
for (i = 0; i < a_array.length; i++) {
tmp_f = true;
for (ii = 0; ii < b_array.length; ii++) {
if (a_array[i] === b_array[ii]) {
tmp_f = false;
break;
}
}
if (tmp_f) {my_result.push(a_array[i])}
}
return my_result;
}
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