pairwise-not=?[procedure] pairwise-not=? compare x1 ...
SRFI-67: Tests if the values x1 ...(zero or more values) are pairwise unequal with
respect to the compare procedure compare. The result is a boolean (either #t or #f). The order in which the values are compared is unspecified, but each value
is compared at least once (even if there is just one).
The values x1, ..., x[n] are pairwise unequal if (not=? compare x[i] x[j])
for all i /= j.
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