int a = data.readInt();
int b = data.readInt();
reply.writeInt...(a);
data.writeInt(b);
mClient.transact(CODE_ADD, data, reply, 0);
int result...(a);
data.writeInt(b);
mClient.transact(CODE_MINUS, data, reply, 0);
int result...(a);
data.writeInt(b);
remote.transact(CODE_ADD, data, reply,...(a);
data.writeInt(b);
remote.transact(CODE_MINUS, data, reply