10 trees

We have to plant 10 trees in 5 lines of each 4 trees.
(a tree at every line intersection). Solution

There are several different solutions. Two solutions are equivallent if we can morph one into the other without "smashing" the intersection points, or if they are the same by rotation or symetry.
How many really different ? Solution

Draw each of these solutions on a square grid with the smallest area.
Solution

Details

 

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