Final answer:
The question addresses English prefixes and the structuring of words with them. It requests sorting words based on these prefixes, such as 'com-' and 'ex-', and observing patterns in spelling.
Step-by-step explanation:
The question seems to be related to the use of prefixes in English language and understanding how to organize words based on them. When it comes to the parent prefixes like com-, ex-, non-, sub-, and others, these are added to the beginning of words to modify their meaning. For example, the prefix com- as in 'combine' suggests 'together', while ex- as in 'exclude' indicates 'out' or 'away'. Sorting words into matrices based on their prefixes or letters following certain consonants is a common exercise to help students understand the structure and formation of words.