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In page The Free Software Definition:
"In 1996, when the gnu.org website was launched, "free software" was defined referring to "three levels of freedom" by adding an explicit mention of the freedom to study the software (which could be read in the two-point definition as being part of the freedom to change the program).[2][3] Stallman later avoided the word "levels", saying that all of the freedoms are needed, so it is misleading to think in terms of levels[citation needed].
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