''' Purpose: function exploration with list manipulations

    Email id: 
    Email id: 

    Pledge: All effort for this assignment has been done as team and when both
            the driver and navigator are present and working together
'''


def rotate( x ) :
    ''' Returns ...

        Driver: 
        Navigator:
    '''

    pass

def rotate_k_times( x, k ) :
    ''' Returns ...

        Driver: 
        Navigator:
    '''

    pass

def common( x, y ) :
    ''' Returns ...

        Driver: 
        Navigator:
    '''

    pass