March Mutant 15: Straight and Arrow / Pearls of Wisdom (total blacks)

In this Straight and Arrow puzzle, the loop may pass through a black cell, but only if it turns in that cell, and goes straight through both adjacent cells in the loop (as though passing through a black pearl in Pearls of Wisdom). All such cells (where the loop turns in that cell and goes straight through both adjacent cells) must be black. The other rules regarding black cells still apply.