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6.3.4 Usage of commas
In SINGULAR, a comma separates list elements and the value of a comma
expression is a list.
Hence, commas cannot be used to combine several expressions into
a single expression. For example, instead of writing
| for (i=1, j=5; i<5 || j<10; i++, j++) {...} // WRONG!!!!!!
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one has to write
| for (i,j = 1,5; i<5 || j<10; i++, j++) {...}
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