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Telephone keypad - Wikipedia
For the numbers 2 through 9 on a telephone keypad (see figure), create two relations: one mapping numbers onto letters, and the other mapping letters onto numbers. Are both relations? functions? Explain.
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Multi-tap - Wikipedia
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Phone keypad. Keyboard template in touchscreen device. User Keypad with numbers and letters for phone. Interface keypad for smartphone. Stock Vector | Adobe Stock
Smartphone dial keypad design. Keyboard template in touchscreen device. User Keypad with numbers and letters for phone. Keypad on smartphone screen. Mobile phone numbers panel 8786495 Vector Art at Vecteezy
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Telephone keypad - Wikipedia
