Why do we say "Necessity is the mother of invention"?

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FROM arcs a
INNER JOIN ezine_previews b ON b.ezine_preview_number = a.ezine_preview_number
INNER JOIN ezine_preview_categories c ON b.ezine_preview_category_number = c.ezine_preview_category_number

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AND arc_obc_flag = 0
AND getdate() >= arc_on_ad_dt
AND getdate() < arc_off_ad_dt

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	            b.ezine_preview_bb_author_link, ezine_preview_bb_link
	
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	            b.ezine_preview_bb_author_link, ezine_preview_bb_link,
	            c.book_reading_guide
	
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FROM arcs a
INNER JOIN ezine_previews b ON b.ezine_preview_number = a.ezine_preview_number

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