Almost all of the asteroids in our solar system are orbiting in a broad band 19,400,000 miles wide between Jupiter and Mars.
Blockage, clogging, or impeded flow, for example, by occlusion or stenosis. obstruction. 1. the act of blocking or clogging. obstruction. 1 something that blocks or clogs. 2 the act of blocking or preventing passage. 3 the condition of being obstructed or clogged. obstruct, v., obstructive, adj.
Permuted blocks is a method of randomization that randomly assigns individuals to a treatment method. In the case of permuted blocks the assignments are based on both a block (method) and a ratio of allocation to the blocks (1:1 this case). Here's a blurb from wiki on permuted block randomization. Quote: