implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

implemented explicitly. If [...] implementation, then the

rule. Note: if sigma’(x) = 0, then an