never {
accept_init:
s0_init:
    if
    :: (p) -> goto accept_s1
    :: !(p) && !(q) && !(r) -> goto s0_init
    :: !(p) && !(q) && (r) -> goto accept_s3
    :: !(p) && (q) -> goto accept_s2
    fi;
s4:
    if
    :: (1) -> goto s4
    fi;
accept_s1:
    if
    :: (1) -> goto accept_s1
    fi;
accept_s2:
    if
    :: !(p) -> goto accept_s2
    :: (p) -> goto s4
    fi;
accept_s3:
    if
    :: (p) -> goto accept_s1
    :: !(p) && (q) && !(s) -> goto accept_s2
    :: (s) -> goto accept_s1
    :: !(p) && !(q) && !(s) -> goto accept_s3
    fi;
}