Given universal schema R$($A$,$B$,$C$,$D$,$E$,$F$,$G$,$H$,$I$)$ and a set of functional dependencies as follows:

AB $->$ CD

A $->$ E

B $->$ FH

C $->$ G

D $->$ B

G $->$ C

H $->$ I

when schema R$($A$,$B$,$C$,$D$,$E$,$F$,$G$,$H$,$I$)$ is normalized or decomposed into the following schema:

R$1($A$,$B$,$C$,$D$)$

R$2($A$,$E$)$

R$3($B$,$F$,$H$)$

R$4($C$,$G$)$

R$5($H$,$I$)$

What nf is this in