I have an array that is already sorted in partitions of 4:
2, 23, 45, 55, 1, 4, 23, 74545, 75, 234, 323, 9090, 2, 43, 6342, 323452
What would be the most efficient way to sort this array? Note: the array size is always even and the program knows that every 4 elements are sorted.