def retrieve_info(dataframe):
    """Function to extract features and concepts from dataframe"""
    concepts = []
    features = []

    for num in range(dataframe.values.shape[0]):
        c = dataframe.iloc[num]['Concept']
        if c not in concepts:
            concepts.append(c)

    for num in range(dataframe.values.shape[0]):
        f = dataframe.iloc[num]['Feature']
        if f not in features:
            features.append(f)
            
    return concepts, features