-Can be words written backwards for example (YOU ARE COOL) = (UOY ERA LOOC). It could also be every pair or every 3 letters a pair of letters are swapped. An example of that would be (YOU ARE COOL) = (OYA UER OCLO)
PLAIN:
F O U R S C O R E A N D S E V E N Y E A R S A G O
1 2 3 4 5 3 2 4 5 1
F C N E R N C E R F
O O D N S D O N S O
U R S Y A S R Y A U
R E E E G E E E G R
S A V A O V A A O S
CYPHER:
N C E R F D O N S O S R Y A U E E E G R V A A O S
