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/usr/lib/s9fes/help/equal-cip is in scheme9 2010.11.13-2.

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S9 LIB  (equal-ci? object1 object2)  ==>  boolean

EQUAL-CI? is like EQUAL? but compares strings and characters
using case-insensitive predicates whereas EQUAL? distinguishes
case.

(equal-ci? '(#\A ("b")) '(#\a ("B")))  ==>  #t