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252 B

package main
import "fmt"
func calc(index string, a, b int) int {
ret := a + b
fmt.Println(index, a, b, ret)
return ret
}
func main() {
x := 1
y := 2
defer calc("AA", x, calc("A", x, y))
x = 10
defer calc("BB", x, calc("B", x, y))
y = 20
}