Please provide an alternative phrasing for the synthesis steps of 19-nor-4,9(10)-androstadienedione (estra-4,9(10)- diene-3,17-dione).
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The steps involved in synthesizing 19-nor-4,9(10)-androstadienedione (estra-4,9(10)- diene-3,17-dione) are as follows: