Nested Orderd List with combination of numbers, alphatets and roman numerals for numbering?

Question

I want to create an ordered list that looks like this:

1. Item_1
2. Item_2:
    a. Subitem_1
    b. Subitem_2:
        I. Sub-Subitem_1
        II. Sub-Subit         


        

Answer 1

1   Default. Decimal numbers (1, 2, 3, 4)
a   Alphabetically ordered list, lowercase (a, b, c, d)
A   Alphabetically ordered list, uppercase (A, B, C, D)
i   Roman numbers, lowercase (i, ii, iii, iv)
I   Roman numbers, uppercase (I, II, III, IV)

http://www.w3schools.com/tags/att_ol_type.asp