I have several lists (for example: list 1 to 4) and would like to combine
them into a summary list. Does anybody know a good way to do this. Thanks a
lot.

Example:
List 1:
A 10
B 20
C 0.1
D 3
E 100
F 0.01
G 5
H 10
I 1
J 10


List 2:
A 11
B 21
C 0.5
D 6
E 10
F 0.2
G 5
H 10
M 5
N 6


List 3:
A 15
B 30
C 0.9
D 9
E 10
F 0.2
K 11
H 10
M 5
Z 1


List 4:
A 20
B 40
C 1.5
D 12
E 10
X 3
K 11
H 10
M 5
Z 2


Summary List
A 10 11 15 20
B 20 21 30 40
C 0.1 0.5 0.9 1.5
D 3 6 9 12
E 100 10 10 10
F 0.01 0.2 0.2 NA
G 5 5 NA NA
H 10 10 10 10
I 1 NA NA NA
J 10 NA NA NA
K NA NA 11 11
M NA 5 5 5
N NA 6 NA NA
X NA NA 3 NA
Z NA NA 1 2