CONCAT DOESN'T WORK CORRECTLY.

[John P]

The build in command CONCAT DOESN'T WORK CORRECTLY ON COMMAND LINE IN CAS MODE, but it works OK in PRGM. MODE. When I want to concatenate two list of lists of the same size ex. {{1,2},{3,4}} on the command line I get the matrix [[1 2 1 2][3 4 3 4]]. When lists are of different size {{1,2},{3,4},{5,5}} and {{1,2},{1,2}} I get the correct result {{1,2},{3,4},{5,5},{1,2},{1,2}}. In PRGM. MODE it works OK regardless the size.