Angle brackets in design script

DesignScript
,
1

I’m trying to understand the use of angle brackets in the syntax and their use with lists. It doesn’t make sense from the documentation. Can someone please explain it.
e.g.

a = [1, 3, 5, 7];
b = [11, 12, 13];
b<1>+a<2>;

What do these numbers in angle brackets mean and how do they work. Thanks

2

Those are the replication guides. They allow you to explicitly alter the lacing order which the function uses. The best write up I have seen on them is this amazing post from @Vikram_Subbaiah: Design Script's ambiguous and versatile Replication Guides <1>

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