```
package main
import (
"fmt"
)
type Action interface {
Sing()
}
type Cat struct {
}
type Dog struct {
}
func (*Cat) Sing() {
fmt.Println("Cat is singing")
}
func (*Dog) Sing() {
fmt.Println("Dog is singing")
}
func Asing(a Action) {
a.Sing()
}
func main() {
cat := new(Cat)
dog := new(Dog)
Asing(cat)
Asing(dog)
}
```
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