Representative messages include "Jean has a long moustache" and "There is a fire at the insurance agency", each one having some meaning to a certain resistance group.[2] They were used primarily to provide messages to the resistance, but also to thank their agents or simply to give the enemy the impression that something was being prepared. Because these messages were in code, not cipher, the occupiers could not hope to understand them without a codebook, so they had to focus their efforts on jamming the messages instead.