I explored the crypt swamp and realized that in 90% of cases, on less-than-ideal maps, there simply can't be that many gnolls. And, as Pasha said, if there are fewer gnolls than indicated, the neutrals will immediately attack the lizards.
Maybe you could come up with something for the swamp after all?)
For example, you could take 5-8 snakes instead of one.
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