Stock Option strikes

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Hi all,

Have a question about how option strikes are set on Nasdaq (or NYSE as well) stocks.
Does anyone know at what exactly what stock price the strike intervals change?

eg. under $20, strikes are spaced every $1
between $20-60, strikes are every $2.5
above $60, strikes are every $5
......

Is there are rule which is the same for every stock on the exchange?
 
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