About the Magician post:

M-A-G-I-C-I-A-N If you erase the M, the first A, the G, the first I and the C, this removes the word Magic from Magician.

What's left is the 2nd I, the 2nd A, and the N.

Then you have a magician without the "magic" part of the word.

This leaves the "ian" part of the word.

Magician-"magic"=Ian. Magician minus magic euals Ian. You call a magician without the magic part of the word Ian because "ian" is all that's left after "magic" is gone.