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This keypad can be connected to any electronic device and has 9 buttons, where each button can have up to 3 lowercase English letters. The buyer has the freedom to choose which letters to place on a button while ensuring that the arrangement is valid. A keypad design is said to be valid if:
• All 26 letters of the English alphabet exist on the keypad.
• Each letter is mapped to exactly one button.
• A button has at most 3 letters mapped to it.

What I have tried:

```This keypad can be connected to any electronic device and has 9 buttons, where each button can have up to 3 lowercase English letters. The buyer has the freedom to choose which letters to place on a button while ensuring that the arrangement is valid. A keypad design is said to be valid if:
• All 26 letters of the English alphabet exist on the keypad.
• Each letter is mapped to exactly one button.
• A button has at most 3 letters mapped to it.```
Posted
Updated 23-Apr-23 22:36pm
Richard MacCutchan 3-Feb-23 4:47am
What is the question?

## Solution 1

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