"Extremely uncommon" would need to be quantified. Beside the case of the strip you mention, there is also the more mundane physical space above the ground, or

"Extremely uncommon" would need to be quantified. Beside the case of the strip you mention, there is also the more mundane physical space above the ground, or other physical limitations. In my case it is not extremely uncommon since I thought to myself a few times recently "oh no, again this £¨%¨¨£ pin".