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.
Join the curtains together into two groups. Join five curtains together to make one group, and join five curtains together to make 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.
They put 50 loops along the edge of the end curtain of one group. And they did the same on the end curtain of the other group.