The less sonorous a vowel (or class of vowels), the more prone it will be to assimilate; and conversely, the more sonorous it is, the more resistant it will be to assimilation.
Standardized
The less sonorous a vowel (or class of vowels), the more prone it will be to assimilate; and conversely, the more sonorous it is, the more resistant it will be to assimilation.
easy to redo as straightforward implication