I want a trainer butterfly knife, but my parents really don't

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My mom doesn't allow me to buy a butterfly knife / balisong that costs more than 51 €, so I wanted to ask if these balisongs from these Italian sites can be

How should a 14-15 year old convince his parents to let him purchase a trainer butterfly knife if they have already said no? - Quora

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My mom doesn't allow me to buy a butterfly knife / balisong that costs more than 51 €, so I wanted to ask if these balisongs from these Italian sites can be

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