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The next row joins to the picots of this row. Tat 4 DS, join to the picots of the previous row, separated by 3DS, then 4 DS, join to the small picot repeat around.
Join the end to the beginning.
The other rows of the Irish Lace Rose are tatted between the center and the outside row of petals, filling in with more rows of petals.
It is TATTING, not crochet, but has a bit of the crochet look to it.