Mozna tez bardziej punkowo
--------------------------------
--------------------------------
--------------------------------
-----------5-5-5-x-7-7------------
-5-5-5-x-3-3-3-x-5-5-0-2-3-3-2-0
-3-3-3-x------------------------
zw.GDC x3
GCD
ref
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--------------------------------
--------------------------------
-----------5-5-5-x-7-7------------
-5-5-5-x-3-3-3-x-5-5-0-2-3-3-2-0
-3-3-3-x------------------------