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You can find photos of these stitches in  Encyclopedia of Tunisian Crochet!
Tunisian Treble Crochet

Basic Instructions:
Any number of chs + 2 extra for the edges.
Row 1 Forward: Yo twice, in 3rd ch from hk, insert hk. *Yo, pull through. Yo and pull through 2 loops on hk. Yo, and pull through 2 more loops, leaving last loop on hk. Yo twice, insert hk into next ch. Repeat from * for all chs.  DO NOT TURN.
Row 1 Return: As you normally would for any Tunisian Crochet st.
The Results will look like Tunisian Crochet Stitches sitting on top of Treble Crochet stitches.
Row 2 Forward: Ch 2, *YO twice, Insert the hook into the Tunisian Crochet portion of the st, Yo, pull through. Yo, pull through 2 loops; Yo and pull through 2 more loops, leaving the last loop on the hook. Repeat from * for all stitches.
Row 2 Return: Same as Row 1-Return.

Treble Purl St-TrcTps
Forward: Ch 2. *YO twice, Put hook to back of piece. Yo and insert hook under top loop of next st, pull through. Yo, pull through. Yo, pull through 2 loops; Yo and pull through 2 more loops, leaving the last loop on the hook. Repeat from * for all stitches.   
2nd row Return: As you normally would for Treble Tks or Tss.

Treble Knit Stitch/Satin St-TrcTks
Forward: Ch 2. *Yo twice, insert hook through the next st  to the back of the piece.   Yo, pull through. Yo, pull through 2 loops; Yo and pull through 2 more loops, leaving the last loop on the hook. Repeat from * for all stitches.  Repeat from * for all stitches.
2nd row Return: As you normally would for Treble Tks or Tss.

Treble Simple St-TrcTss
Forward: Ch 2. *Yo twice. Slip hk under uppermost vertical thread of next st. Yo, pull through.  Yo and pull through two loops, leaving the third loop on the hk. *Repeat across row with each st, working last st as you normally would for Tss.
Return: Yo pull through one loop. *Yo and pull through two loops.

I have trouble with these stitches, since I tend to pull the tension tight on the lower portion of the stitch, thus leaving the upper portion very loose.  This makes for an interesting visual effect, but does not make for a very tight, heat trapping stitch.  I use this for light-weight pieces such as spring and fall shawls/afghans.

Treble Full St-TrcTfs:
This stitch is almost impossible, since pulling the yarn to the front of the piece will remove the Yo's for the Treble Crochet portion of the stitch.  Even if you do the Yo's backwards, they still gets lost in the mechanics of the stitch, and just isn't worth the effort.
Forward: Ch 2. *Yo twice, insert hook between the current and next sts. Yo, and pull through. Yo and pull through two loops, leaving the third loop on the hook.  *Repeat across row with each st, working last st as you normally would for Tks.
Return: Yo and pull through one loop. Yarn over and pull through two loops.
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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