Hold on!
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https://www.reddit.com/r/SpaceXLounge/comments/p2uq1q/all_the_proposed_starship_orbital_refuel/
Warning: this link might be unsafe, please double check the link before you proceed.
https://www.reddit.com/r/SpaceXLounge/comments/p2uq1q/all_the_proposed_starship_orbital_refuel/