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I'm using GNU APL. Also, I'm not really sure what the correct name for this is, but the basic idea is that I have a list of things and I want to do something with each pair. It's complex, so I've made a function for it. I notice that this works:
2+/1 2 3 4 5
┌→──────┐
│3 5 7 9│
└───────┘
...