A value in replace_with_strings can be either single string or list of strings

def replace_strings_in_list(array_of_strigs, replace_with_strings):
    "A value in replace_with_strings can be either single string or list of strings"
    potentially_nested_list = [replace_with_strings.get(s) or s for s in array_of_strigs]
    return list(flatten(potentially_nested_list))