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.
Chair Guidelines - Brezlin. As the chair back angle increases, the seat should be tilted further backward to prevent forward sliding and lowered to prevent the ... A back height of about 12 to 16 above the seat is ideal for most adults. ... a backrest height of 9 to 11 inches,.