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Apr 30, 2021 at 9:09 comment added joni +1 for mentioning Birskorn's book. The theoretical limit is $n-2$ breaks for $n$ even and 0 breaks for $n$ odd. If I remember correctly, this result is due to De Werra.
Apr 30, 2021 at 8:53 history answered Walter Sebastian Gisler CC BY-SA 4.0