you are right, I had changed the name of subroutines and variables. and qx/date/ actually useless... thank you find the bug!
I'm still learning about OOP perl, thank you for indicate this is good example to use OOP, I will rewrite it after.
circular marginal is a interesting idea! when you find some big/beautiful pattern the wall is so annoying. infinite board maybe a good choice, but it need a dynamic display...
have a nice day :)
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