<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def list_contains(list_of_strings, substring, return_true_false_array=False):
 """ Get strings in list which contains substring. """

    key_tf = [keyi.find(substring) != -1 for keyi in list_of_strings]
    if return_true_false_array:
        return key_tf
    keys_to_remove = list_of_strings[key_tf]
    return keys_to_remove