Change boundary Parabolic() (or other PDE solvers)

In the PDE toolbox example for the function parabolic(), the 'squareb1' argument is used to set Dirichlet boundary conditions u = 0 on a unit square. If I want to use for instance Neumann conditions what value should I use.
Additionaly if I wanted to change the unit square described as: 'squareg'

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Asked:

on 21 Mar 2012

Closed:

on 20 Aug 2021

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