Note : Read the following stanza to answer Question Nos. 55 and 56 : "The Jamuna's waters rush by so quickly, / The shadows of evening gather so thickly, / Like black birds in the sky ... // O! If the storm breaks, will betide me? / Safe from the lightning where shall I hide me? / Thou succour my footsteps and guide me. / Ram re Ram! I shall die." 'Like black birds' in the above lines is an example of