Detecting highly-overlapped objects in crowded scenes remains a challenging problem. especially for one-stage detector. In this paper. we extricate YOLOv4 from the dilemma in a crowd by fine-tuning its detection scheme. https://www.markbroyard.com/deal-time-gtech-airram-mk2-k9-roller-roll-brush-bar-filter-vacuum-cleaner-hot-on-sale-best-find/