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{"density":5.2,"proportion.forceps":0.02}
{"density":12.7,"proportion.forceps":0.66}
{"density":20,"proportion.forceps":0.19}
{"density":25.6,"proportion.forceps":0.06}
{"density":32.7,"proportion.forceps":0.55}
{"density":33.8,"proportion.forceps":0.62}