A (3)

Although, after, as

W (6)

When, whenever, where, whereas, whether, while

H (1)

Hence

I (2)

If, in order

T (3)

Though, That, Than

E (2)

Even, Even if

B (2)

Before, because

U (2)

Until, Unless

S (2)

Since, so that

OTHERS (3)

Once, Rather, Provided