Question: L = { w epsi { 0 , 1 } * : w in Sigma * | every prefix of w has at
L w epsi : w in Sigma every prefix of w has at least as many s as s
Clarification: L states "Every prefix of w contains equal or more s than s
Select the correct CFG for L:
A S SS S epsi
B S SS Sepsi
C S SS Sepsi
D S SS S epsi
A prefix is a string consisting of several first letters of a given string, without any reorders. An empty prefix is also a valid prefix. For example, the string "abcd" has prefixes: empty string, aab "abc" and "abcd".
points
a and d
a and b
a and c
a b and d
a b and c
a b c and d
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