The west and south ones are easiest to handle. Drop most of row 20 while leaving row 21 and the south ones are taken care of; similarly, drop column 17 while leaving column 16.
×For the north and east giants, you need to construct a "
bag"
, with a "
lip"
that prevents the giants escaping.
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×But the lip can only be a single tile (because you can't backtrack across the thin ice while constructing the bag), so it will only hold
one of the giants back.
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×The bag on each side should be exactly the right size so that one of the giants blocks the other.
