Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on So You Think You Ca<img><img><img><img>n Take The Derivatives: <a href="https://youtu.be/YsffeqzsSrk" target="" rel="nofollow">https://youtu.be/YsffeqzsSrk</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <div>(Tweet me you wearing the shirt at <a href="https://twitter.com/blackpenredpen" target="" rel="nofollow">https://twitter.com/blackpenredpen</a> &amp; I will retweet!)</div> </div><a target=""><img><img><img><img><img><img><img><img><img><img></a>

$19
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on 100 derivatives: <a href="https://www.youtube.com/watch?v=AegzQ_dip8k" target="" rel="nofollow">https://www.youtube.com/watch?v=AegzQ_dip8k</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <br> Tag me on Instagram @blackpenredpen of you wearing the shirt and I will share your photo on my story!<br> </div>

$22
Derivatives For You

<div>BACK BY POPULAR DEMAND!!</div><div>As featured on 100 derivatives: <a href="https://www.youtube.com/watch?v=AegzQ_dip8k" target="" rel="nofollow">https://www.youtube.com/watch?v=AegzQ_dip8k</a> <a target=""></a> </div><div> <img><img><img><img><img><img><img><img><img><img><img><br> </div><div>Make your classmates and teachers jealous!!</div><div>But please, DO NOT WEAR THIS DURING EXAMS!!!  <div><br></div> <br> Tag me on Instagram @blackpenredpen of you wearing the shirt and I will share your photo on my story!<br> </div>

$22