Mosaic knitting
Slip selected stitches from the previous colour while working only one colour in a row.
Counted practice swatch
Cast on 20, an even number. Knit two setup rows in A.
Work the repeat
Rows 1–2 in B: [k1, sl1 purlwise] 10 times. On row 1 keep yarn behind; on return row 2 keep yarn in front. Rows 3–4 in A: knit all stitches. Repeat 4 rows.
Read the fabric
A slipped stitch is carried through the pair of rows. Do not slip it again in the next colour pair in this simple repeat; the full-knit A band resets every stitch.