Under The Cliff Like’ is constructed from the ‘Title And First Line Index’ in the 1962 edition of ‘Granger’s Index To Poetry’ (Columbia University Press. U.S.A.) which I found in a junk shop. It was written in 1996. In alphabetical order all entries beginning with ‘Like’ are juxtaposed with the equivalent number of entries beginning with ‘Under’. There are no alterations other than elimination of commas and the capital letter of the juxtaposed line plus the insertion of full stops at the end of each pairing.
Some samples will appear over the next 5 days.
IF P THEN Q 
Feels like ‘Like’ was the appropriate button to tick under this! Well done Tim 🙂