1, kid, dare to bubble me! You said, is it a single or group? Group, let's give you one; one pick, you pick us!
2, often function and index function E of X times walking on the street, seeing differential calculations far away,
The frequent function is scared to hide, say: "It is different from it, I don't have anything!"
The index function is not panicked: "Can it like me, I am e, X-times!"
The index function meets the differential operator.
