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If you load SLIB module,
require is extended. See section 11.15
slib - SLIB interface for
requirewon't load the same file again. Usually this procedure should be called at the end of the Scheme file that is to be
required. The reason that it should be at the end of file is that if an error is raised during loading, you may want to fix the error and
#tif feature is already provided.