Have found iv. via Google. It comes from the second verse of The Hippopotamus Song a.k.a. "Mud, Mud, glorious (Les Gray's) Mud":
The fair hippopotama he aimed to entice From her seat on that hilltop above As she hadn't got a ma to give her advice Came tiptoeing down to her love Like thunder the forest re-echoed the sound Of the song that they sang when they met His inamorata adjusted her garter And lifted her voice in duet
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timeasmymeasure
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Date: 2012-01-04 12:20 pm (UTC)The fair hippopotama he aimed to entice
From her seat on that hilltop above
As she hadn't got a ma to give her advice
Came tiptoeing down to her love
Like thunder the forest re-echoed the sound
Of the song that they sang when they met
His inamorata adjusted her garter
And lifted her voice in duet