Order Crossover

OX preserves the relative order of elements from one parent. Specifically, it preserves a contiguous block of positions from parent 1, and the relative order of remaining elements from parent 2.

1. Choose cut points $c_1<c_2$.
2. Copy segment $P_1[c_1:c_2]$ into the child at the same positions.
3. Starting from position $c_2+1$ in $P_2$ (wrap around), fill empty child slots with elements not already present, preserving $P_2$‘s order.

So the end result would be: $[7,6,4,5,1,3,2]$.

Another example:

For some reason this example fills cyclically from position $c_2+1$? But the first one fills in order from the start.