I found Athena at a college career fair. They asked questions about my projects and resume then sent a coding screening before giving a phone interview.

The recruiter failed to deliver my initial screening twice and forgot to email me the puzzle after scheduling time/dates with me over the phone. After submitting code, I received no acknowledgement of receipt and probing for a follow up a few weeks later, received no response at all to voicemail/email.

Write a program that can calculate the number of possible unique sequences of remaining tokens for removing one Morse code message from another.