Simple Matrix Question

[Tirthankar C.P]

What is the simplest way to read in a matrix, say


19911231 12200 4274
 19921231 12205 7822
 19931231 3313 8208
 19941231 2362 12292
 19951231 4348 11673
 19961231 11751 14255 
19971231 6318 12339
19981231 14901 11530
19991231 373 17353 


in perl? I just know that the matrix has to have three rows, but the
number of columns can vary. 

any ideas? 

TIA, 
-tir