**Question:**\nValidate that a sequence of coins does not violate the property: no more than 2 in a row face the same direction.\n\n**Examples:**\nTFTFTF- OK\nTTFTTF - OK\nFFTFFT Ok\n\nTTT- Invalid\nFFF - Invalid\nFTTTF - Invalid\nTFFFT - Invalid\n\n**Follow-up:**\nWhat if `k` faces?

Question:\nValidate that a sequence of coins does not violate the property: no more than 2 in a row face the same direction.\n\nExamples:\nTFTFTF- OK\nTTFTTF - 