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Hi José, Just to say, I'm thoroughly enjoying your book. One thing confused me though: on pages 78 and 79, you define a list list = {{a1, b1, c1}, {a2, b2, c2}, {a3, b3, c3}} and then use replacement list /. {a_, b_, c_} -> a/(b + c)...
I too have had problems after running a loop that blink the LEDs. Same symptoms as yours, and the same solution: restart the kernel. Has anyone managed to find any answers to this?