
    Design a function for an adaptive learning system that determines if a specific learning concept or keyword exists within the available educational content library. The function should search through a collection of lesson titles and topic descriptions to identify if the target learning concept is present as a substring in any of the materials. The system will use this functionality to locate and suggest relevant educational content that matches students' learning needs.
    

    
def find_substring(str1, sub_str):
    """
    Design a function for an adaptive learning system that determines if a specific learning concept or keyword exists within the available educational content library. The function should search through a collection of lesson titles and topic descriptions to identify if the target learning concept is present as a substring in any of the materials. The system will use this functionality to locate and suggest relevant educational content that matches students' learning needs.
    

    """
def find_substring(str1, sub_str):
    """
    Design a function for an adaptive learning system that determines if a specific learning concept or keyword exists within the available educational content library. The function should search through a collection of lesson titles and topic descriptions to identify if the target learning concept is present as a substring in any of the materials. The system will use this functionality to locate and suggest relevant educational content that matches students' learning needs.
    

    """
    if any((sub_str in s for s in str1)):
        return True
    return False