What does the e in the verb pensar change to in four of the six present tense conjugation

a venn diagram (also known as a set diagram or logic diagram) is a diagram that shows all possible logical relations between a finite collection of different sets. they are thus a special case of euler diagrams, which do not necessarily show all relations. venn diagrams were conceived around 1880 by john venn.create a venn diagram showing all of the similarities and differences you can think of. do your best to put your comparison in spanish, and use everything you know about adjectives and comparison phrases in spanish.