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ABBREV.: Of the 4 main compass points these 3 are also symbols of elements
N
(
N
_
T
R
_
G
_
N
)
,
S
(
S
_
L
P
H
_
R
)
&
W
(
T
_
N
G
S
T
_
N
)
Clue
SULFUR/SULPHUR
MANGANESE & MAGNESIUM
SILICON & ALUMINUM
N (NITROGEN), S (SULPHUR) & W(TUNGSTEN)
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