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open SSG, "<ADRX.ssg" || die "can\'t open ADRX.ssg"; ... open(SSG, ("<ADRX.ssg" || die "can\'t open ADRX.ssg"));
open(SSG, "<ADRX.ssg") || die "can\'t open ADRX.ssg"; open SSG, "<ADRX.ssg" or die "can\'t open ADRX.ssg";