There's a direct conflict between 'activities' and 'movies'.
There are two rules that handle the ies -> y and ies -> ie cases. In the current order, they get movies right but fail on activities. When switched, they get activities right but fail on movies.
Could make 'activities' irregular, but there are a bunch of other words that follow that pattern, e.g., berries.
Could make 'movies' irregular, but there are a bunch of other words that follow that pattern, e.g., mostly slang words like talkies, cuties, movies, etc.
There's a definite split in the rule with no clear regex that could divine the correct singularization.
There's a direct conflict between 'activities' and 'movies'.
There are two rules that handle the ies -> y and ies -> ie cases. In the current order, they get movies right but fail on activities. When switched, they get activities right but fail on movies.
Could make 'activities' irregular, but there are a bunch of other words that follow that pattern, e.g., berries.
Could make 'movies' irregular, but there are a bunch of other words that follow that pattern, e.g., mostly slang words like talkies, cuties, movies, etc.
There's a definite split in the rule with no clear regex that could divine the correct singularization.