[C1](https://math.stackexchange.com/q/3902712/11619), [C2](https://math.stackexchange.com/q/3899422/11619),
[C3](https://math.stackexchange.com/q/3902792/11619),
[C4](https://math.stackexchange.com/q/3902792/11619).
[C3](https://math.stackexchange.com/q/3902792/11619),
[C4](https://math.stackexchange.com/q/3902792/11619).