carbon and silicon
manganese and phosphorous
carbon and manganese
carbon and sulfur
12 m and 12 m
12 m and 13 m
13 m and 12 m
13 m and 13 m
only (i)
(i)and(ii)
(ii) and (iii)
(i) and (iii)
height
foot width
head width
any of the above
head
web
foot
head and foot both