Universal 403:

Original: If a construction involves a free and a bound constituent which convey the same meaning and one of them is optional, it is always the free form that is optional and never the bound one.
Standardized: If a construction involves a free and a bound constituent which convey the same meaning and one of them is optional, it is always the free form that is optional and never the bound one.
Keywords: optionality
Domain: inflection, syntax
Type: no genuine implication; rather: provided that
Status: achronic
Quality: absolute
Basis: Hungarian (Ugric, Uralic)
Source: Moravcsik 1994a: 45

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