Abstract
This paper concerns the problem of discovering an unknown grammar from a text sample. The discovering methods are formulated as optimisation problems based on a binary representation of context-sensitive grammars. The representation starts with a longest possible vector of bits to, finally, make it more compact so as to be usable in practical applications. For the sake of simplicity, considered are only noncontracting (length preserving) grammars of order 2, excluding productions of the form P:A→B and those deriving the empty string, i.e P:A→ε.
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