Compare the "shunt" part to this rhyme:

I took my wife to the station to see the engine's shunt
a pice of steel fell off the wheel and hit her in the,
country girls are nice country girls are sweet
country girls sit on your knee and fiddle with your,
willy was a bulldog lying in the grass
along came a bumble bee and stung him up the.
ask no question's tell no lie's
have you ever seen a policeman pulling up his,
fly's are nuisance gnat's are worse
this is the end of my silly little verse.

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