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Keep practicing — related questions

• 1 7 2 6 3 5 4...........
• 1 7 2 6 3 5 4...........
• 3,3,5 4,4,3 5,5,4 3,?
• 6
• 3, 3, 5, 4, 4, 3, 5, 5, 4, ?
• 3 8 4 6 5 4 6..............
• 3, 3, 5, 4, 4, 3, 5, 5, 4, ?