What, if any limit is there regarding the number of numerics that can be supplied. I noticed that you're using x, y, & z as non-specific identifiers for a pending calculation. Are these to be returned as letters, or as calculated (ie: use them as variables). Also do you only use x, y & z, or are other letters possbile based upon the number of numerics supplied. If the latter, where do the letters start, and if there are too many numerics supplied to cover the letters allocated, do the letters repeat, or is an error expected?