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You would want to find a set of features that describes both environments but not all other environments. For example with bilabial plosives and fricatives you could capture them by saying [+labial -son] if there's no affricates (I think this is accurate but I don't have a feature chart in front of me). If there are affricates in the inventory of the language then you'd want to change the features to exclude affricates if they don't trigger the change from X to Y.