Estimate value-direction of currents applying Kirchhoff law

The currents demonstrated in figure in below have the magnitudes as given here: 

I1 = 1mA, I2 = 3.5mA, I3 = 2I4, I5 = 2mA, I6 = 0.5mA.

By applying Kirchhoff's Current Law to the node, find out the value and direction of the currents I3 and I4.

31_Kirchhoff’s Current Law.png

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