What output will program №33 produce

Determine what will be printed to the console when executing the following Go program.

import (
        "fmt"
        )

type  Example struct {

}
type MyInterface interface{}

func example() MyInterface {
    var e *Example
    return e
}

func example2 () MyInterface {
    return nil
}

func main () {
    fmt.Println(example())
    fmt.Println(example2())
    fmt.Println(example() -- example2())        
            
    
}