Countdown Palimpsest

Here is one Fillomino puzzle:

pal-1a

Remove all fours, and it turns into a Slitherlink:

pal-1b

Remove all threes, too, and it turns into a Tapa:

pal-1c

Remove all twos as well and it turns into a Simple Loop (with the ones acting as black squares):

pal-1d

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