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Flattening the sub-lists Check if a string is entirely made of the same substring How do I check if a string is entirely made of the same substring? Reattaching fallen shelf to wall? Raising a bilingual kid. When should we introduce the majority language? What *exactly* is electrical current, voltage, and resistance? How would I use different systems of magic when they are capable of the same effects? How to open locks without disable device? Would reducing the reference voltage of an ADC have any effect on accuracy? How long after the last departure shall the airport stay open for an emergency return? ...