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This Three and One Tweed Mosaic pattern is a classic slip-stitch pattern worked in two colors.
In fact, this particular slip-stitch pattern uses a garter-stitch based mosaic structure. That means that there are no purl stitches – good news for anyone who does not like purling!
What is more, the pattern repeat is only over 4 rows, making this a very easy pattern to master and memorize.
As with all mosaic patterns, you only use one color for each pair of rows you knit. However, you use slipped stitches to create vertical columns of color.
Actually, this is achieved as the slipped stitches pull stitches of contrasting color up.
Furthermore, mosaic patterns work best when working with colors that are quite contrasting, as they will make your pattern pop more.
We have a very comprehensive article about mosaic knitting including how to knit mosaic patterns that you may find interesting. You can find the article here: All You Need to Know About Mosaic Knitting.
In addition, if you would like to learn more about slipping stitches, we have a step-by-step tutorial you may like. In fact, you can find this tutorial here: Slipping Stitches Knitwise or Purlwise

Techniques Needed for Three and One Tweed Mosaic Pattern
Abbreviation Description Tutorial
k knit Knit Stitch Continental Style
Knit Stitch English Style
p purl Purl Stitch Continental Style
Purl Stitch English Style
Other Abbreviations Used
ws wrong side
rs right side
rep repeat
st(s) stitch(es)
wyif with yarn in front
wyib with yarn in back
Instructions (Knitted Flat)
Multiple of 4 sts plus 3. Colors A and B.
Cast on with Color B and knit one row
Row 1(RS): With A, k3 * sl 1 wyib, k3; rep from *
Row2: With A, k3 * sl 1 wyif, k3; rep from *
Row 3: With B, k1, * sl 1 wyib, k3; rep from *, end sl 1, kl
Row 4: With B, k1, * sl 1 wyif, k3; rep from *, end sl 1, kl
Repeat rows 1-4 until you reach the desired length.