Question: DEnormal on a list of differential equations

Hi all !

I have a list of coupled ordinary differential equations 

L := [e1,e2,e3] = [diff(z(t), t, t)*m = 0, diff(x(t), t, t)*m - B*diff(y(t), t)*q = 0, diff(y(t), t, t)*m + B*diff(x(t), t)*q = 0] with unknown functions x(t),y(t),z(t).

I want to obtain the list of "normal forms" of the ode using the DEnormal function. The help page says that it is possible to use it with an operator list but none example is given. 



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