Simpler strings can substitute for more-complex strings {contracting grammar}. Simpler strings cannot replace strings {non-contracting grammar}.
Grammars {normal-form grammar} can allow symbols to become two symbols, for example, replacing sentence symbols with noun and verb symbols.
Grammars {standard-form grammar} can allow symbols to become one or two strings, for example, replacing speech-part symbols with letter strings.
Grammars {well-formed grammar} can allow simple to complex substitutions.
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Date Modified: 2022.0225