I have the following four sample sheets (well, there's a fifth and sixth one, but they aren't needed for the purposes of this post). These sheets list 3 columns, but in reality, there's 16 columns total.
ABC1PeriodAppt DateAcct2 7:30a09/20/218915433 8:00a09/20/218896564 8:20a09/20/218409655...