diff --git a/p23/p23.org b/p23/p23.org
index 2caff2c..cb1b3c8 100644
--- a/p23/p23.org
+++ b/p23/p23.org
@@ -151,17 +151,16 @@ co,de,ka,ta.
 #+begin_src emacs-lisp
   (defun grow-clusters(dataset)
     (let ((counter 0))
-      (-distinct
-       (--map  (-sort #'string< it)
-               (-mapcat (lambda (cluster)
-                          (message (format "cluster %d . %d / %d" (length
-   cluster)
-                                           counter (length dataset)))
-                          (setq counter (+ 1 counter))
-                          (--map (cons it cluster)
-                                 (-reduce #'-intersection
-                                          (-map #'neighbours cluster))))
-                        dataset)))))
+      (prune-clusters
+       (-mapcat (lambda (cluster)
+                  (message (format "cluster %d . %d / %d" (length
+  							 cluster)
+                                   counter (length dataset)))
+                  (setq counter (+ 1 counter))
+                  (--map (cons it cluster)
+                         (-reduce #'-intersection
+                                  (-map #'neighbours cluster))))
+                dataset))))
 
   (-filter #'good-computer-p computer-list)
 
@@ -169,7 +168,7 @@ co,de,ka,ta.
     (when l (cons l l)))
 
 
-  (setq links (--map (list (car it) (cdr it)) data-asym))
+  (setq links (prune-clusters (--map (list (car it) (cdr it)) data-asym)))
 #+end_src
 
 #+RESULTS:
@@ -260,7 +259,6 @@ co,de,ka,ta.
 | xx | xa |
 | re | wy |
 | ux | zt |
-| pr | wz |
 | kx | qq |
 | ja | dw |
 | pi | zk |
@@ -296,7 +294,6 @@ co,de,ka,ta.
 | fo | fb |
 | iv | no |
 | nw | rk |
-| yg | wz |
 | wp | se |
 | dx | qw |
 | vl | dg |
@@ -314,7 +311,6 @@ co,de,ka,ta.
 | bg | iy |
 | hc | dc |
 | re | rj |
-| qp | pr |
 | bq | gk |
 | tt | la |
 | dj | aj |
@@ -379,7 +375,6 @@ co,de,ka,ta.
 | cx | ym |
 | eh | ax |
 | fp | iv |
-| wz | ml |
 | fm | ju |
 | tf | xa |
 | ge | yi |
@@ -499,7 +494,6 @@ co,de,ka,ta.
 | lr | fd |
 | gl | cj |
 | ed | ls |
-| qp | tg |
 | ov | ob |
 | sv | zs |
 | ut | qm |
@@ -662,7 +656,6 @@ co,de,ka,ta.
 | dg | cl |
 | xn | pf |
 | cs | az |
-| wz | zo |
 | er | kl |
 | ws | us |
 | ik | il |
@@ -702,7 +695,6 @@ co,de,ka,ta.
 | ez | de |
 | zd | vu |
 | ln | mp |
-| wz | xq |
 | uh | fm |
 | wh | qm |
 | hf | df |
@@ -828,7 +820,6 @@ co,de,ka,ta.
 | yi | ko |
 | ja | nn |
 | cp | mz |
-| ml | qp |
 | dl | yk |
 | nb | rj |
 | ra | wn |
@@ -1354,7 +1345,6 @@ co,de,ka,ta.
 | zc | ef |
 | mi | su |
 | py | iy |
-| ho | qp |
 | wl | mo |
 | vs | iz |
 | iu | il |
@@ -1397,7 +1387,6 @@ co,de,ka,ta.
 | fh | fo |
 | di | xp |
 | bq | te |
-| wz | tg |
 | fq | sv |
 | ba | er |
 | fv | ow |
@@ -1615,7 +1604,6 @@ co,de,ka,ta.
 | ea | gt |
 | wr | so |
 | gm | cf |
-| qp | hx |
 | ae | ov |
 | tm | tn |
 | zv | xy |
@@ -2071,7 +2059,6 @@ co,de,ka,ta.
 | ea | go |
 | ep | wk |
 | tl | ob |
-| wz | hx |
 | lg | lz |
 | hx | xo |
 | zg | dw |
@@ -2432,7 +2419,6 @@ co,de,ka,ta.
 | yo | gb |
 | lj | pn |
 | pv | ay |
-| qp | zo |
 | wf | pb |
 | nj | kb |
 | qo | ik |
@@ -2649,7 +2635,6 @@ co,de,ka,ta.
 | ho | un |
 | eh | ch |
 | jv | sw |
-| fu | wz |
 | dp | us |
 | ij | ct |
 | lz | vo |
@@ -2690,7 +2675,6 @@ co,de,ka,ta.
 | kr | mi |
 | la | vl |
 | js | tr |
-| ee | qp |
 | ae | cp |
 | wr | qm |
 | lj | ez |
@@ -2704,7 +2688,6 @@ co,de,ka,ta.
 | hb | re |
 | iu | we |
 | ty | fs |
-| jj | qp |
 | ih | yr |
 | bs | yz |
 | pj | gp |
@@ -2718,7 +2701,6 @@ co,de,ka,ta.
 | aa | tw |
 | ub | iy |
 | fx | hj |
-| qp | fu |
 | qq | gt |
 | ys | jo |
 | xm | fh |
@@ -2798,7 +2780,6 @@ co,de,ka,ta.
 | fk | cx |
 | sc | gh |
 | xp | hu |
-| ee | wz |
 | xr | gx |
 | va | zm |
 | gs | ev |
@@ -2828,7 +2809,6 @@ co,de,ka,ta.
 | cs | ft |
 | ys | gf |
 | gg | im |
-| xo | wz |
 | ln | ah |
 | ot | dm |
 | zh | hm |
@@ -2891,7 +2871,6 @@ co,de,ka,ta.
 | no | ip |
 | st | ec |
 | xv | ty |
-| qp | qr |
 | vz | wr |
 | yz | as |
 | xg | hj |
@@ -2934,7 +2913,6 @@ co,de,ka,ta.
 | hb | tx |
 | ba | bi |
 | wa | sl |
-| qr | wz |
 | my | bq |
 | yw | oj |
 | wk | hc |
@@ -2998,7 +2976,6 @@ co,de,ka,ta.
 | bt | dj |
 | wc | og |
 | au | ao |
-| xo | qp |
 | bf | jc |
 | jb | dl |
 | wx | jp |
@@ -3305,7 +3282,6 @@ co,de,ka,ta.
 | bq | df |
 | rj | mh |
 | go | vp |
-| yg | qp |
 | js | kd |
 | pb | fc |
 | lz | xs |
@@ -3429,7 +3405,6 @@ co,de,ka,ta.
 | jp | vn |
 | jc | ly |
 | xi | ch |
-| wz | jj |
 | zr | ag |
 | ya | fz |
 | zt | mt |
@@ -3554,7 +3529,18 @@ co,de,ka,ta.
 | ys | vt |
 | wt | kz |
 
+
 #+begin_src emacs-lisp
+  (defun prune-clusters (clusters)
+     (let ((remove-list (car clusters))
+  	   (remainder (cdr clusters))				  
+  	   )
+       (when remove-list (cons remove-list  (--remove (-intersection it remove-list) remainder)))
+         )
+    )
+
+
+
   (setq poly-sequence (--unfold (split (grow-clusters it)) links))
                                           ;    (-last-item poly-sequence)