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Creates a new Index by copying a part of selected Index.
Given the following Index:
1 (number of columns) "" (no column name)
"dag allemaal"
"hallo"
"tot morgen"
6 (number of elements)
2
1
2
3
2
3
The command Extract part... 1 2 gives you the new Index:
1 (number of columns) "" (no column name)
"dag allemaal"
"hallo"
"tot morgen"
2 (number of elements)
2
1
Note that all classes stay intact and may have zero references like for example the "tot morgen" class.
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