Supposing i have a module Mod.pm which has a statement "require /a/b/script" and there is a script run.pl which has the statements "use Mod" and "require /a/b/script", then, when any routine inside /a/b/script is called from run.pl, I get the "Undefined routine ..." error. This error does not appear when the require statement is removed from Mod.pm module, but the vice versa is not true (ie when I remove the require statement from run.pl and retain the one in Mod.pm, the error still persists).
Can you please explain why multiple use statements are not a problem but multiple "require" statements cause an issue?
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