Enumeration weakens the rule in cases not enumerated.

Explanation

Where specific items are listed, the rule is affirmed for those items but weakened — and may be negated — for everything not named; the enumeration draws a boundary that excludes the unenumerated.

Where this applies

• The statute lists specific items and anything not on the list is excluded.
• By enumerating particular things, the rule is weakened for everything not named.
• The enumeration draws a boundary — what's not named may be outside the rule.