Go: Concatenate slices

Use append and add dots after the second slice:

a := []int{1, 2}
b := []int{11, 22}
a = append(a, b...) // a == [1 2 11 22]

The ... unpacks b. Without the dots, the code would attempt to append the slice as a whole, which is invalid since a is not a slice of slices.

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