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/usr/share/systemtap/tapset/README is in systemtap-common 1.7-1+deb7u1.

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Systemtap scripts under this directory are NOT meant for
direct execution.  They are not sample end-user scripts,
but rather constitute the "standard library" from which
other scripts can pull in definitions from.

For samples of end-user scripts, see the web
http://sourceware.org/systemtap/documentation.html

See also http://sourceware.org/systemtap/wiki/TapsetStatus