never {
accept_init:
s0_init:
    if
    :: (p) && (q) && !(r) -> goto s0_init
    :: (r) -> goto accept_s1
    :: !(p) && !(r) -> goto s2
    :: (p) && !(q) && !(r) -> goto s2
    fi;
s2:
    if
    :: !(r) -> goto s2
    :: (r) -> goto s3
    fi;
s3:
    if
    :: (1) -> goto s3
    fi;
accept_s1:
    if
    :: (1) -> goto accept_s1
    fi;
}