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A quite distinct descendant of SNOBOL, developed by Griswold
et al in 1967. SNOBOL4 is declarative with dynamic scope.
Patterns are first-class data objects that can be
constructed by concatenation and alternation. Success and
failure are used for flow control. Delayed (unevaluated)
expressions can be used to implement recursion. It has a
table data type. Strings generated at run time can be treated
as programs and executed.