OK, how would you write an array to a .csv?

e.g.

stored in Array(x,x) as string

Array(0,0) = 1
Array(0,1) = 12
Array(0,2) = 123
Array(1,0) = a
Array(1,1) = ab
Array(1,3) = abc


Output to .csv

1,12,123
a,ab,abc