1.Letters :
=> Upper Case Letters A to Z
=> Lower Case Letters a to z
2. Digits :
=> 0 to 9
3. Special Characters :
+ - * / = % # ? ^ " , ~
! \ / < > ( ) [ ] { } : ; blank space
4. White Space
- Blank space
- Horizontal return
- Carriage return
- New line
- Form feed
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