Puzzletober 2025: Lesson

And the locks were an interesting development, thinks the newcomer as he sits in his room eating the emergency chocolate. But there's something else weighing on his mind. It may have seemed tangential, but it felt important nonetheless. He studies the commemorative scarf he was gifted upon returning from the cabin. The embroidery seemed to embellish a random pattern, but he begins to notice a structure. One here, two there; skip one, two, or four. Is it a code? He remembers the discrepancy, and something about Samuel... and suddenly everything clicks. Once he is certain the scarf contains harmless information, he writes a message to its maker using the code. He needed to express that he'd learned his lesson.

Rules: Decode the message. (It is recommended to find an efficient method of doing so.)

BWBWWWWBWBBWWBBWBBWWWWBWBWBWWBBWBBWBBWWBWBBWBWWBWBBWBWWBBWBWBBWBBWWWWBWBWBBWBWWBBWBBWBBWWBWBBWBWWWWBWBBWBWBWWBBWBWBBWBBWWBWBWWBBWBWWBBWBBWBWWWWBBWWBBWBBWBBWWWWBBWBWBBWBBWWBBWBBWBBWWBWBWBBWWBWBBWBWWWWBBWBWBWWBWBBWWBWBWBBWWBBWBBWBWWBWBWBWBWWBBWWBWWBWBBWBWWWWBWBBWWBBWBWBWBWWBBWBBWBBWWBWBWBBWWBBWWWWBBWBBWWBBWBWBBWBBWWWWBWBBWBWWBBWBBWBBWWBWBBWBWBWWBWWWWBWBBWWBBWBWWBBWBWBWWWWBBWBBWWBBWBBWBBWWBBWWBWBWWBWBWBWBBWWBWBBWWBBWWBWBWWBBWBBWBBWWBBWBWWWWBWBWWWWBBWBWBWWBBWBBWBBWWWWBBWBWWBBWBBWBBWWBBWWWWBWBWBWWBWBWBBWWBWBWBWWBWBBWBBWBWWBWWBBWBWBBWBWWBBWWWWBWWBWBWWBBWWBWBWBWBWWBWWBWBBWBWWWWBBWBBWBBWWBWBWBBWBWWWWBBWBWBBWBBWWBBWBBWBBWWBWBWBB