Look at the expression
=AND(EXACT(B9:F9,B9))
if you select the text part of that EXACT(B9:F9,B9)
Now Press F9 it displays {TRUE,TRUE,TRUE,TRUE,TRUE}
Which is the comparisson of F9 with each cell in the range
In this case they are all exact matches and so it displays an array of "True""
The And()...