The plural of rule is rules.
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The regular plural form of a noun adds (s) or (es) to the singular noun.
Rules of thumb
Change the Y in I and add ES. Story -> Stories
The plural of receipt is receipts. This follows the general rule for forming plurals, which is simply to add an "s" at the end.
The plural of colleague is colleagues. This follows the basic rule for forming most plurals: just add an "s".