1
 2A = a
 3B = b
 4C = c
 5D = d
 6E = e
 7F = f
 8G = g
 9H = h
10I = i
11J = j
12
13SOME = A B C
14
15export F G H I J
16
17export D E $(SOME)
18
19all: ; @echo A=$$A B=$$B C=$$C D=$$D E=$$E F=$$F G=$$G H=$$H I=$$I J=$$J