Premise: British NVC community OV6 ("Cerastium glomeratum" - "Fumaria muralis" ssp. "boraei" community) is one of the open habitat communities in the British National Vegetation Classification system. It is one of six arable weed and track-side communities of light, less-fertile acid soils.
Hypothesis: British NVC community OV6 is among ten arable weed and track-side communities of light, less-fertile acid soils.