Context: In paragraph 13 the judges raise the issue of the perpetrators' access to the victims: "The historical examples of genocide also suggest that the area of the perpetrators’ activity and control, as well as the possible extent of their reach, should be considered. ... The intent to destroy formed by a perpetrator of genocide will always be limited by the opportunity presented to him. While this factor alone will not indicate whether the targeted group is substantial, it can—in combination with other factors—inform the analysis."

Question: The issue of what is raised by judges in Paragraph 13? 
Answer: perpetrators' access to the victims

Question: What is the basis for suggesting that several factors regarding the activity of the perpetrators be considered? 
Answer: historical examples of genocide

Question: The extent of what by the perpetrators was considered in an examination of their activity and level of control?
Answer: possible extent of their reach

Question: What will always be restricted in terms of a perpetrator's intent to destroy?
Answer: the opportunity presented to him

Question: While the factor cannot independently indicate if the targeted group is substantial, it can do what?
Answer: inform the analysis

Question: What issue is raised by other factors in Paragraph 13?
Answer: Unanswerable

Question: What is the basis for suggesting that several factors regarding the victims be considered?
Answer: Unanswerable

Question: The extent of what by the perpetrators was considered in an examination of their analysis?
Answer: Unanswerable

Question: What will always be restricted in terms of a victim's intent to destroy?
Answer: Unanswerable

Question: What can historical examples do, even though they cannot independently indicate if the targeted group is substantial?
Answer: Unanswerable