Please. I don't understand the rank stuff. 

   f1 6 f2@f3@f4@f5 7 14 NB. This gives the result I want.
2 4
1 1

   6 f1@f2@f3@f4@f5 7 14 NB. but not this
  2  2.83
0.5 0.354

   6 f1@:f2@f3@f4@f5 7 14 NB. this is correct. 
2 4
1 1

WHY is @: needed here and not everywhere?

   6 f1@(f2@f3@f4@f5) 7 14 NB. This works
2 4
1 1

   6 f1@(f2@f3)@f4@f5 7 14 NB. and this
2 4
1 1


The following definitions and explanations should not be necessary in order to 
understand the problem, but just in case they are: The verb f5 is a dyad while 
f4 f3 f2 and f1 are monads. f4 and f3 are hooks. f5 and f1 are forks.f2 is a 
gerund.

   f5 
1 , ,:
   6 f5 7 14
1  1
6  6
7 14

   f4 
% +/@{:
   f4 6 f5 7 14
0.0476 0.0476
 0.286  0.286
 0.333  0.667

   f3
,: -.
   f3 f4 6 f5 7 14
0.0476 0.0476
 0.286  0.286
 0.333  0.667

 0.952  0.952
 0.714  0.714
 0.667  0.333

   f2
%~`*`:3"2
   f2 f3 f4 6 f5 7 14
  2    4
0.5 0.25

   f1
}: , %:@*/
   f1 f2 f3 f4 6 f5 7 14
2 4
1 1
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