Diagram 3 (redux)

                               ""
                                |
                  ----------------------------------------------------
                  |                            |            |        |
                Alpha                        Beta         Gamma    Delta
                  |                            |            |
       -------------------------         ------------       |
       |                       |         |          |       |
    Epsilon                  Zeta       Eta       Theta   Iota
       |                       |                            |
       |                 ------------                       |
       |                 |          |                       |
     Kappa            Lambda        Mu                    Delta