Problem with Extend Line tool in ArcPy?

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I have a problem with Extend Line tool in ArcPy, it cannot extend some lines, i tried to get around by erasing the edges of lines that i want to extend without failure, but despite this some fewer lines remains not extended to any feature in the same layer.

an example of Extend commande

arcpy.ExtendLine_edit("Line_fc" , "", "FEATURE")

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