What does the number in parentheses mean in the grammar explanation?

I sometimes see numbers in parentheses in the structure section of a grammar explanation (ばかりに, for example), but I’m not sure what it means. Maybe that である can replace な in this case?

Structure

Verb[た]+ ばかりに
[い]Adjective + ばかりに
[な]Adjective + な(1) + ばかりに
Noun + な(1) + ばかりに

(1) である

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In this case it is showing that な can be replaced with である so
Noun + である + ばかりに

Hope that helps clear things up!

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