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+UMB Scheme is an implementation of the language described in the
+"IEEE Standard for the Scheme Programming Language" (December,
+1990).
+
+All syntax, variables and procedures are implemented. Integers
+are implemented as fixnums and bignums, rationals as pairs of
+integers, (inexact) reals as double-precision floats, and (inexact)
+complex numbers as pairs of double-precision floats.