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Probably a typo, but you are very right. if you are aiming to make an explosion, then you should combine the hydrogen and the oxygen. because if you just have hydrogen, then the balloon pops, and the air has to combine with the oxygen in the air to catch on fire, whereas the balloon with the oxygen and hydrogen combined will not have to mix with air to blow up. it is alot louder, bigger, and way more dangerous when you blow that balloon up. DO NOT TRY THAT AT HOME!!!!!!!!!! TRUST ME, BECAUSE I KNOW!!!! OK!!! NEVER!!!!!!!!!!!
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