Arrange sentences A, B, C and D between sentences 1 and 6 to form a logical sequence.
1. There are, moreover, unconscious aspects of our perception of reality.
A. Within the mind they become psychic events.
B. The first is the fact that even when our senses react to real phenomena, sights and sounds, they are somehow translated from the realm of reality.
C. Not to speak of the fact that every concrete object is always unknown in certain respects.
D. Thus every experience contains an indefinite number of unknown factors.
6. The reason is, we cannot know the ultimate nature of matter itself.