D, E, F, T = same 4 letters...

try this out everyone...it'll help explain why a lot of us may have thought only 3 letters were the same too:

How many "F's" - upper and lower case - are in this passage?

Kant… accepted the notion of things-in-themselves existing independently of any knowledge… As his starting point [he took it] that any specific knowledge we claim to have of such and such an external object is obtained through our senses, [and] hence is at best only indirect and questionable… What we know directly and with certainty is therefore only the set of our ideas. [For example,] the very notion of causality [is] a priori mode of human understanding, in other words, an idea. - d’Espagnat