/usr/lib/open-axiom/input/pinch.input is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | -- @(#)pinch.input 1.1 89/09/07 20:55:10
draw((x**2 - y**2)/(x**2 + y**2),x = -1..1,y = -1..1)
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