You can reuse a collision by appending identical data to both pieces of colliding data and the result still collides. The collision google found exists in the

You can reuse a collision by appending identical data to both pieces of colliding data and the result still collides. The collision google found exists in the PDF before the JPEGs, and both JPEGs are appended after the collision -- the difference in the earlier data is where the differing instructions exist that say either to display the first or the second JPEG.