I was trying to find an occurrence of שבוע as a dual number noun using the Hebrew construct search and found that I was unable to match the lexem (either שבוע or שבע). When I tried the list of possible lexems did not include either choice.
I then tried just a simple search for the lexem and found that the popup list again did not include either choice. I was able to use a liters search to find exact matches, but this made it difficult to find the dual number hit I was intending to find i.e. Lev. 12:5
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