Consider the circles C(1)equivx^(2)+y^(2...

Consider the circles `C_(1)equivx^(2)+y^(2)-4=0,C_(2)equivx^(2)+y^(2)-6x+8=0` and `C_(3)equivx^(2)+y^(2)-8x-2y+16=0`. The number of common tangents that can be drawn to touch at least two of the circles is

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