Soundex Explanation:
1. Retain the first letter of the Last Name.
2. Remove all occurrences of the following letters, unless it is the first letter: a,e,h,i,o,u,w,y.
3. Assign numbers to the remaining letters (after the first)
        *b,f,p,v = 1
        *c,g,j,k,q,s,x,z = 2
        *d,t = 3
        *l = 4
        *m, n = 5
        * r = 6
4. If two or more letters with the same number are adjacent, omit all but the first.
5. Return the first four characters, adding zeroes at the end if there are fewer than four.