Experiment Setup ● Three real data sets TABLEⅤI DATASETS Datasets Cardinality Avg Len Max Len Min Len Word 146.033 16.0l 35 Author 10.27 million.02 383 Email 6.4 million 26.58 57 Existing algorithms Bed-Tree downloaded from its hompage) Adaptive Q-gram(we implemented) Flamingo(downloaded and we extended it to suppert topk query) 2/2/2021 Topk Search(@ ICD E2013 47/42Experiment Setup  Three real Data sets  Existing algorithms  B ed -Tree (downloaded from its hompage)  Adaptive Q-gram (we implemented)  Flamingo(downloaded and we extended it to suppert topk query) 2/2/2021 TopkSearch @ ICDE2013 47/42