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You can find photos of these stitches in  Encyclopedia of Tunisian Crochet!
6 Stitch Diagonal Stripes

Tks/Tps
Chain number in multiples of 12 + 2 extra chs.  (48, 72, 108 + 2)
Row 1 Forward and Return: follow instructions for Afghan stitch.
Row 2 Forward: (Work 6 Tks.  Work 6 Tps.) Repeat pattern across row to last st.  Work last st as you normally would for Tks.
Row 2 Return: As you normally would for Tks.
Row 3 Forward: Work 5 Tks. *Work 6 Tps.  Work 6 Tks.  Repeat from * across row to last 2 sts.  Work 1 Tks.  Work the last st as your normally would.
Row 3 Return: As you normally would for Tks.
Row 4 Forward: Work 4 Tks. *Work 6 Tps.  Work 6 Tks.  Repeat from * across row to last 3 sts.  Work 2 Tks.  Work the last st as your normally would.
Row 4 Return: As you normally would for Tks.
Row 5 Forward: Work 3 Tks. *Work 6 Tps.  Work 6 Tks.  Repeat from * across row to last 4 sts.  Work 3 Tks.  Work the last st as your normally would.
Row 5 Return: As you normally would for Tks.
Row 6 Forward: Work 2 Tks. *Work 6 Tps.  Work 6 Tks.  Repeat from * across row to last 5 sts.  Work 4 Tks.  Work the last st as your normally would.
Row 6 Return: As you normally would for Tks.
Row 6 Forward: Work 1 Tks. *Work 6 Tps.  Work 6 Tks.  Repeat from * across row to last 6 sts.  Work 5 Tks.  Work the last st as your normally would.
Row 6 Return: As you normally would for Tks.
Row 7 Forward: (Work 6 Tps.  Work 6 Tks.)  Repeat across row to last 6 sts.  Work the last st as your normally would.
Row 7 Return: As you normally would for Tks.
Row 8 Forward: Work 5 Tps. *Work 6 Tks. Work 6 Tps.  Repeat from * across row to last 2 sts. Work 1 Tps.  Work the last st as your normally would.
Row 8 Return: As you normally would for Tks.
Row 9 Forward: Work 4 Tps. *Work 6 Tks.  Work 6 Tps.  Repeat from * across row to last 3 sts.  Work 2 Tps.  Work the last st as your normally would.
Row 9 Return: As you normally would for Tks.
Row 10 Forward: Work 3 Tps. *Work 6 Tks.  Work 6 Tps.  Repeat from * across row to last 4 sts.  Work 3 Tps.  Work the last st as your normally would.
Row 10 Return: As you normally would for Tks.
Row 11 Forward: Work 2 Tps. *Work 6 Tks.  Work 6 Tps.  Repeat from * across row to last 5 sts.  Work 4 Tps.  Work the last st as your normally would.
Row 11 Return: As you normally would for Tks.
Row 12 Forward: Work 1 Tps. *Work 6 Tks.  Work 6 Tps.  Repeat from * across row to last 6 sts.  Work 5 Tps.  Work the last st as your normally would.
Row 12 Return: As you normally would for Tks.
Repeat Rows 2-12 to create the pattern.

Use these instructions for all the Diagonal Stripes; just substitute other stitches for the Knit and Purl (Tks, Tps).  You can also reduce the number of stitches in the Groups; just figure the beg ch based on the number of stitches you use.
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For a diagram of all the various Threads of a Tunisian Crochet Stitch,
Click Here!
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Abbreviations:  
Beg: Beginning
 Ch: Chain stitch   
Lp: Loop  
Hk: Hook
DO: drop off
PU: pick up
Sk: skip stitches
Sl St: slip stitch
Yo: Yarn Over hook
Tks-Knit st  
Tss-Simple/Afghan St Tps-Purl St
 Trs-Reverse St
 Tfs-Full/Plain St

Trps-Reverse Purl st