for (var i = 0; i < skill.children.length; ++i) {
            if (user.skills.find(obj => obj.name == skill.children[i].name) != undefined) user.skills.find(obj => obj.name == skill.children[i].name).parents = user.skills.find(obj => obj.name == skill.children[i].name).parents.filter(obj => obj != skill.name);
        }