Read Exodus 36:12 Using Other Translations
Fifty loops made he in one curtain, and fifty loops made he in the edge of the curtain which was in the coupling of the second: the loops held one curtain to another.
He made fifty loops on the one curtain, and he made fifty loops on the edge of the curtain that was in the second set. The loops were opposite one another.
The fifty loops along the edge of one curtain matched the fifty loops along the edge of the other curtain.