In the 121 Advanced Puzzles Vol. II, there are two no-op twins
from zero in the "Variations" Chapter.
(I already solved them, but they were awesome
)
PS: I actually just got a No-op bonus puzzle, and I was kind of annoyed that I had to fill in the operators to finish the puzzle, because it was kind of unnecessary. I mean, it doesn't matter when submitting no-op book puzzles, so why have it online?