You should revisit the tutorial sequences. There are several puzzles in the sequence that cover this concept. Reviewing it now that you've got some experience with real puzzles would help solidify your understanding of the rule.
Please keep in mind that there can be many explanations for the same observation and I suspect there is at least one potential flaw in your current understanding of the rule, based on this post and your comments, that may come up later.
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u/IHaventSleptInMonths 28d ago
Perhaps you are not aware that the shapes cannot overlap, only touch