Preferably, use a perforating wheel to cut,
but in lack of such, you can cut along lines with a scalpel,
taking care to not cut all the way to the edge.
As a kid, I was sometimes left all alone at the communal pool in St. Saturnin-les-Apt to so I could make friends (and glance at girls who didn’t glance back). Each one has a little surprise in the wrapper. It used to be a comic with a Monsieur Malabar strongman when I was a kid. Now it’s little fake tats. Swapping these little gems was the languageless way to break the ice with the other kids. I can chew gum and walk at the same time, but not really chew gum and talk - which was perfect as I barely spoke a french word.