Reverse of a String

Definition

The reverse of a string s denoted by Rev(s) or  s^r,  is obtained by writing the letters of s in reverse order.

Example

If s=abc is a string defined over Σ={a,b,c}

then Rev(s) or s^r = cba

Example

Σ= {B, aB, bab, d}

s=BaBbabBd

Rev(s)=dBbabaBB

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