never {
accept_init:
s0_init:
    if
    :: (p) -> goto s3
    :: (1) -> goto s4
    :: (q) -> goto s3
    fi;
s1:
    if
    :: (0) -> skip
    fi;
s3:
    if
    :: (0) -> skip
    fi;
s4:
    if
    :: (p) -> goto s1
    :: !(q) -> goto s1
    :: (p) && (q) -> goto s0_init
    :: !(p) && !(q) -> goto s0_init
    :: (p) && !(q) -> goto accept_s2
    fi;
accept_s2:
    if
    :: !(p) && !(q) -> goto s1
    fi;
}