The end last strategy is an official supported strategy.
***[Edit this flow diagram](https://mermaidjs.github.io/mermaid-live-editor/#/edit/Z3JhcGggVEQKQVtOZXcgc3Vic2NyaXB0aW9uIHJlcXVlc3RdIC0tPiBCe0V4aXN0cyBzb21lIGFjdGl2ZSBzdWJzY3JpcHRpb24_fQpCIC0tPnxZZXN8IENbSGFzIGEgcGVybWFuZW50IHN1YnNjcmlwdGlvbiBhY3RpdmU_XQpDLS0-fFllc3wgRFtSZXR1cm4gdGhlIHBlcm1hbmVudCBzdWJzY3JpcHRpb25dCkMtLT58Tm98IEVbT2J0YWluIHRoZSBsYXN0IGVuZCBkYXRlIGFzIGEgc3RhcnQgZGF0ZV0KQi0tPnxOb3wgRltTZXQgY3VycmVudCBkYXRlIGFzIHN0YXJ0IGRhdGVdCkYtLT5aCkUtLT5aW0NyZWF0ZSBzdWJzY3JpcHRpb25d?theme=forest)***The main rule of this strategy is continue the subscriptions chaining them with the last. Keep in mind that could be have a permanent subscription; in that case, nothing happens.