Arrow Head
if you click on a arrow numbered 1 , arrow {1,2,4} will rotate 90 degree from present position.
Similarly ,if you click on a arrow numbered 2, arrow {2,1,3} will rotate 90 degree from present position.
if you click on arrow numbered 3,4 arrows {2,3,4}, {1,4,3} will rotate 90 degree respectively.
so what following pattern should be clicked to bring all arrow heads down as show in picture?
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