What is the relation between slot machines and the number 7?

What is the relation between slot machines and the number 7? 7 slot machine Dana: So, player shows 7 and stands player always stays on 6, 7, 8 and 9… @ 2000 Slot Machines @ Bitcoin, Visa, MasterCard, Skrill, PayPal, Neteller 7 diamond slot Seven-O: Every time a 7 is played, whoever played it must swap hands The UNO slot machine featured a basic vertical 3 wheel system, along with 3

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