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For this tutorial you'll need to know how to make Chains (CH), I have a tutorial here! How to make the Slip Knot, tutorial here! And how to make the Slip Stitch (SL ST), tutorial here!
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Start with 2 squares that you want to join together (tutorial for these listed above)
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Make a Slip Knot with the yarn you're using for the join (tutorial for these listed above)
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Insert your hook into one corner of one of the squares
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Add the Slip Knot onto your hook
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Bring that Slip Knot through the corner space
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Insert your hook into the corresponding corner space, on the other square
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Grab the yarn you're working with and pull it through both spaces and that loop on your hook to create a Slip Stitch
You'll now have the front of each square facing out and the backs of the squares together on the inside
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*Insert your hook into the next ST on the square farthest from you, from the front to back of the square (Shown Above)
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Grab the yarn you're working with pull, it through that stitch, to make a SL ST
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Insert your hook into the corresponding stitch on the other square, insert your hook into the front of the square, to the back of your square (Shown Above)
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Grab the yarn you're working with pull, it through that stitch, to make a SL ST
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Repeat the steps above from *, you can see in the picture above how to Zig Zag SL ST Join is forming
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You'll reach the next corners of the squares
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Insert your hook into the corners, front to back through the square farthest from you
Grab the yarn you're working with pull, it through that stitch, to make a SL ST
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From here you would fasten off, tutorial here!
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Check out this playlist featuring more Square Joining Techniques here!
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Boxed Picot Stitch, tutorial here!
Linked Double Crochet Stitch, tutorial here!
The Verity Stitch, tutorial here!