And there is no originality in it; only endless permutations and combinations of doctrines already known and accepted.
There are numerous permutations to be taken into account, sight being one factor.
Every unit of the rth species which does not vanish is the product of r different units of the first species; two such units are independent unless they are permutations of the same set of primary units e i, in which case they are equal or opposite according to the usual rule employed in determinants.
There are lots of plumbing supplies on the market, and even the trusty plumbing wrench comes in a number of permutations.
Luckily, the Worldwide Web Consortium has created many tutorials such as "First CSS" that explain how the properties work in various permutations.