This (internal) blend of 2 bidraps blends one trip each into a tutrip.

Incidence matrix according to Dynkin symbol

reduced( oxx4/2xox&#x , by ..x4/2..x )   → height(12,3) = sqrt(5/8) = 0.790569
(pseudo {4} || so)

         o..4/2o..      & | 8 * | 1 2  2 0 | 3 2 1 2 | 1 3 1
         ..o4/2..o        | * 4 | 0 0  4 2 | 0 2 4 4 | 0 4 2
--------------------------+-----+----------+---------+------
         ...   x..      & | 2 0 | 4 *  * * | 2 0 0 2 | 1 2 1
         oo.4/2oo.&#x     | 2 0 | * 8  * * | 2 1 0 0 | 1 2 0
         o.o4/2o.o&#x   & | 1 1 | * * 16 * | 0 1 1 1 | 0 2 1
reduced( ..x   ...    ) & | 0 2 | * *  * 4 | 0 0 2 2 | 0 2 2
--------------------------+-----+----------+---------+------
         ox.   ...&#x   & | 3 0 | 1 2  0 0 | 8 * * * | 1 1 0
         ooo4/2ooo&#x     | 2 1 | 0 1  2 0 | * 8 * * | 0 2 0
         o.x   ...&#x   & | 1 2 | 0 0  2 1 | * * 8 * | 0 1 1
         ...   x.x&#x   & | 2 2 | 1 0  2 1 | * * * 8 | 0 1 1
--------------------------+-----+----------+---------+------
         ox.4/2xo.&#x     ♦ 8 0 | 4 8  0 0 | 8 0 0 0 | 1 * * so
         oxx   ...&#x   & ♦ 3 2 | 1 2  4 1 | 1 2 1 1 | * 8 *
reduced( o.x4/2x.x&#x ) & ♦ 4 4 | 2 0  8 4 | 0 0 4 4 | * * 2