Results of repeated calls to Esearcher.inquire() are accumulated

Hi, i iterate over a list of search terms "qt below) and submit each to PM using these params: a = e.inquire({'db':'pubmed','term':qt, 'rettype': 'uilist', 'sort':'relevance'})

When calling a.get_results() after each query, the results accumulate.

Am I doing sth. wrong?