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Consider a function defined in [-2,2] ...

Consider a function defined in `[-2,2]`
`f (x)={{:({x}, -2 le x lt -1),( |sgn x|, -1 le x le 1),( {-x}, 1 lt x le 2):},` where {.} denotes the fractional part function.
The total number of points of discontinuity of `f (x)` for `x in[-2,2]` is:

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