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- valist = list of variable number of arguments va_start: Think of this as "starting the list". It initialises the list to point to the first variable argument. va_arg: This is how you get the next argument from the list. va_end: This "ends the list" and cleans things up. va_copy: This is for copying the list. more here: https://hackernoon.com/what-is-va_list-in-c-exploring-the-secrets-of-ft_printf