The fourth robot actually shows an A on his chest panel on the 2nd chorus of YMCA. You just can't really see it. On the first chorus, he's not trying to make the A either... he's shaking his head in confusion.
To ensure the robots were in sync from the beginning, they had to start in the exact same positions, meaning we often had to 'scare' them with their flinch sensors to reset their bodies prior to starting the program.
To keep them in sync, we had to use Thread.sleeps and just move on to the next action instead of utilizing the waitUntilStop command.
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