How to look for a specific character sequence in a set of strings with an AND requirement?

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To look for a specific character sequence in a set of strings with an AND requirement, you can use the following steps:

1. Define the specific character sequence you are looking for.
2. Iterate over the set of strings.
3. For each string, check if it contains the specific character sequence using a conditional statement.
4. Keep track of which strings contain the specific sequence.
5. Return the set of strings that contain the specific sequence for all iterations.

Here is an example Python code that looks for the character sequence 'abc' in a set of strings with an AND requirement:

strings = set(['abcdef', 'abcxyz', 'pqrabc', 'xyzabc'])
specific_seq = 'abc'
result = set(strings)

for string in strings:
    if specific_seq not in string:
        result.remove(string)

print(result)

This code will output the set containing the two strings that contain the 'abc' sequence: {'abcdef', 'abcxyz'}.