Note The string of a handle forms a complete right-hand side of one production; The rightmost position of the handle string is at the top of the stack To be the handle, it is not enough for the string at the top of the stack to match the right-hand side of a production. Indeed, if an 8-production is available for reduction, as in Example 5.1, then its right-hand side (the empty string)is always at the top of the stack. Reductions occur only when the resulting string is indeed a right sentential form For example, in step 3 of Table 5.1 a reduction by S8 could be performed, but the resulting string(s s)is not a right sentential form, and thusais not the handle at this position in the sentential form(s)• Note: – The string of a handle forms a complete right-hand side of one production; The rightmost position of the handle string is at the top of the stack; – To be the handle, it is not enough for the string at the top of the stack to match the right-hand side of a production. • Indeed, if an ε-production is available for reduction, as in Example 5.1 ,then its right-hand side (the empty string) is always at the top of the stack. • Reductions occur only when the resulting string is indeed a right sentential form. – For example, in step 3 of Table 5.1 a reduction by S→ε could be performed, but the resulting string( S S ) is not a right sentential form, and thusεis not the handle at this position in the sentential form ( S )