never {
accept_init:
s0_init:
    if
    :: !(P) && (Q) && !(R) -> goto s1
    :: !(Q) -> goto s0_init
    :: (R) -> goto s0_init
    :: (Q) && !(R) -> goto accept_s2
    fi;
s1:
    if
    :: (R) -> goto s0_init
    :: !(P) && !(R) -> goto s1
    fi;
accept_s2:
    if
    :: !(R) -> goto accept_s2
    fi;
}