'A simple CFG corresponding to the following code structure:
c = (... if ... else ...) + ...
return b + c'

def loopless1(self):

    g = self.from_adj_list({0: [18, 12], 12: [21], 18: [21], 21: []})
    g.set_entry_point(0)
    g.process()
    return g
