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The England and Wales Cricket Board have proposed a 100-balls-a-side format for a new domestic competition that will start in 2020. It had been thought that the eight team men's and women's competitions, due to involve city-based sides rather than the traditional 18 first-class counties, would have a standard 20-overs per side format. But English men's county cricket, which pioneered the 20-over game as a professional format, already has the Twenty20 Blast, while the Women's Super League is also a 20 overs per side competition.