These three words are not so confusing, but the way they are built is interesting.
Sequence is a noun which means "order".
Con- is a prefix meaning “with,” “together,” “in association.” Consequent, as a result of all these previous procedures coincide.
Sub- is a prefix with the meaning “under,” “below,” “beneath”. Subsequent, the "understep", the next step
discriminate
verb
1. to treat differently because of prejudice
2. to detect differences, especially small or subtle ones, to differentiate or distinguish
incriminate
verb
to accuse of a crime or other wrongful act