Loop 2 in 1 (459)

Draw a single closed loop that travels horizontally and vertically through all white cells. Some cells may remain empty. The loop cannot touch or cross itself. The loop must take a turn in each black circle and must pass straight throug each white circle.
The top grid shows the solution from the first grid drawn over the solution of the second grid. Each loop segment in the top grid must be drawn in at least one of the bottom grids. There cannot be a loop segment in any of the bottom grids that is not present in the top grid. The empty cells are fully blacken in the solution grid.

Reference: WPC 2016 (65)