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utility function to compare 2 arrays deeply
// utility function, returns true if arr1 is equal to arr2
function arrays_are_equivalent(arr1, arr2, ret) {
if(ret === undefined) ret = true;
if(arr1.length != arr2.length) return false;
arr1.forEach(function(ele, i) {
if(ele instanceof Array) {
ret = ret && arrays_are_equivalent(ele, arr2[i]);
else if(ele !== arr2[i]) {
ret = false;
return ret;
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