Let f:W rarr W is defined as f(x)={:{ (...

Let `f:W rarr W` is defined as `f(x)={:{ (x/2 ,x = 2n-2, n in N), (0, x=2n-1, n in N) :}` .Then the number of points lying on both `y=f(f(x))` and x -axis,`x in[0,10]` ,is

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