never {
s1_init:
    if
    :: !(p) && (q) && (r) && (s) -> goto accept_s2
    :: !(p) && (q) && !(r) && (s) -> goto s5
    :: !(p) && !(q) && (s) -> goto s4
    :: !(s) -> goto s1_init
    fi;
s4:
    if
    :: !(p) && !(q) -> goto s4
    :: !(p) && (q) && !(r) -> goto s5
    :: !(p) && (q) && (r) -> goto accept_s2
    fi;
s5:
    if
    :: !(r) -> goto s5
    :: (r) -> goto accept_s6
    fi;
accept_s2:
    if
    :: (r) -> goto accept_s6
    :: !(r) -> goto s5
    fi;
accept_s6:
    if
    :: (1) -> goto accept_s6
    fi;
}