UNO Rules You Don't Have To Say 'UNO Out' On Last Card

People seem to be split on whether it is a requirement, but UNO has cleared it up once and for all

In the Uno card game, if I have only one card left in my hand and it's the 'swap hand' card, what will happen? What is the actual rule? - Quora

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CONTENTS 36 King-Size, My First UNO Cards with Sesame

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