بس ملاح الحمد لله الصلاة والسلام على رسول الله الطلب الأعزاء السلام عليكم ورحمة الله وبركاته وأهلاً وبرحباً بكم في هذا الجزء الثانية عشر من المحوار الثاني مدد نظريت العلات فيورية ومشينس هنا أريد أن أخبار some exceptions for good-bye condition سمتعينيس the good-bye conditions will give an incorrect result سنواتنا two examples نظر هنا the first example here the number of solids is equal 5 L is equal 5 the ground first one two three four and five OK لعبنا أخبار six pins here the first one, the second, the third, the fourth, the fifth and the sixth and now the higher pair of joints for this mechanism if we calculate m so we find m equal zero normally it should be what it should be a structure foreground between m and plus zero here crispy formula gives wrong mobility because three links is parallel and equal in length these three links are parallel and equal in length OK let's see the next example here so the number of links n or L equal 5 links نةilingual Bomb حسنا because here this mechanism is a structure. here no but here yes it is a structure. so here the good path formula is correct.