[<+>] ->
Arg C : &EventCounter 
    A, B : EventCounter

C = <
      % : A.%
      Counter : A.Counter + B.Counter
      Min_time : (
                   A.Min_time << A.Min_time < B.Min_time

                              >> B.Min_time
                 )
      Max_time : (
                   A.Max_time << A.Max_time > B.Max_time

                              >> B.Max_time
                 )
    >

/

[<.>] ->
Arg B : ^&EventCounter, A : EventCounter

B.Counter += A.Counter

/