called with [5, 10, 8, 10, 1]
called with [5, 10]
called with [5]
called with [10]
returning [5, 10] 0
called with [8, 10, 1]
called with [8]
called with [10, 1]
called with [10]
called with [1]
returning [1, 10] 1
returning [1, 8, 10] 2
returning [1, 5, 8, 10, 10] 5
5