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Caption=Пару паралельних прямих перетинає пряма OP,~~яка постійно проходить через точку O на одній з них~~і рухому точку P на другій з цих прямих.~~Точки P' та  P'' лежать на прямій OP та відстоять ~~від точки P на відстань n по різні сторони від точки P.~~При русі точки P вздовж прямої JP точки P' та P'' ~~описують відповідно внутрішню та зовнішню конхоїди.~~ 
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