Edit, copy and paste

[ChaosDazer]

Change one letter in the previous persons word, and copy and paste it how many times you see fit.

I'll start

COPY COPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOP
YCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOP
YCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYC
OPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCO
PYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPY
COPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCO
PYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOP
YCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPYCOPY