never {
s0_init:
    if
    :: (1) -> goto s0_init
    :: !(p) && (q) && !(r) -> goto accept_s1
    fi;
accept_s1:
    if
    :: (r) -> goto accept_s2
    :: !(p) && !(r) -> goto accept_s1
    fi;
accept_s2:
    if
    :: (1) -> goto accept_s2
    fi;
}