You can use ^ and %, but must enter them in the _Alphanumeric variable twice as ^^ or %%. However, if you want to use the result (_RndAlphaNum) later in the batch file (other than Echoing to the screen), they might require special handling. You can even use a space, as long as it's not the last character in the string.
23 inches (59cm) is the minimum distance required for a chair behind a desk. This would fit a modest sized chair. For more comfort and to accommodate a bigger office chair increase the chair clearance to 30 inches (76cm). Office Chair tips. Swivel chairs make it easier to get in and out from behind your desk, especially if the space is a bit tight.
Dining Chair: The seat height averages 16 to 17, seat width averages about 15-1/2 in back and 18 in front, average seat depth is 16 to 16-1/2. if arm rests are used, they should be 7 to 9 above the seat but able to fit under the table apron. average width between arm rests at the front of the chair is approximately 19.