Explanation:

Given, ‘Square disturb on down’ is coded as ‘dl ta ap ea’

‘Square wall on disturb’ is coded as ‘dl ap ta uv’

‘down wings inner beauty’ is coded as ‘xy df ss ea’

‘disturb beauty wall down’ is coded as ‘ta ss uv ea’

Comparing the statements, we have Square on = dl ap (but not necessarily in the same order)

Disturb = ta

Down = ea

Wall = uv

Beauty = ss

Wings Inner = xy df (but not necessarily in the same order)

Hence, code ‘ea’ is the code for ‘down’