In a code cell, assign string 'good' to variable s1, 'bad to variable s2' and 'silly' to variable s3. Write Python expressions involving strings s1, s2, and s3 that correspond to (translate the following human language to Python expression) a) l' appears in s3 b) the blank space does not appear in s1 c) the concatenation of s1, s2, and s3 d) the blank space appears in the concatenation of s1, s2, and s3 e) the concatenation of 10 copies of s3 f) the total number of characters in the concatenation of s1, s2, and s3