There were 50 loops on the end curtain in one group, and 50 loops on the end curtain in the other group. The loops were opposite each other.
Make 50 loops down the edge of the end curtain of one group. Do the same for the end curtain of the other group.
Use blue cloth to make loops along the edge of the end curtain in one group. Do the same on the end curtain in the other group.
There must be 50 loops on the end curtain of the first group. And there must be 50 loops on the end curtain of the other group.
Then they used blue cloth to make loops along the edge of the end curtain of one group. And they did the same on the end curtain in the other group.