"High Incident" Puzzle

When the bankrobbery was over (along with the episode), Bobby and Rita had a trial. Bobby went to jail, but Rita did not. Rita visited Bobby in jail all the time. On one occasion, he handed her this slip of paper:

She was very confused, but he just told her to wait. On her next visit, he handed her another slip of paper. She opened it up when she got home. It said:

She compared her two notes and quickly realised it must be some sort of code.

Can you help Rita decipher the message?

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