Q 3917
[out of order_insert important]
tells us that CA, BIG can be changed to get correct context in drop.
remember the missle?
In several drops the CA assumed to be Cal, is actually the CIA as in Watch the clowns, or a hint that a clown op is involved.
In several drops of which there are many BIG can be changed to B_G, BG bill gates for proper context.
Knowing Q and what I looked at briefly every 'I' removed from BIG can be used to get CIA from CA, with no leftovers.