One day, a colleague from the office hands you the following message without a comment and makes a quick retreat out of your cubicle. Can you make head & tails from this? What is your colleague trying to tell you here?
The solution to this puzzle is an English sentence and this is not a rebus puzzle. Hints will follow if the message is not deciphered in due time.
The first line is part of the code instruction, the second line is a self-verification step: If you can make the number on the left represent a G you have probably found the code algorithm and can apply it to the 3rd line, which is the message.
"G" does not represent anything but the letter G itself.
You did miss it at first, but the paper slip has been very carefully punctuated with a needle on the right edge. It seems that two different needles have been used too...