Hi! On 7:49 why Alice could not revoke her offer? It is stated that the mailbox is received by Alice on March 17 and she was trying to revoke on March 16. I guess it's a different explanation from your previous video (kzbin.info/www/bejne/pZyVgIihfs-Dd7Msi=zM8OPVV2CuxRmsOa) on 10:19.