The keys
[left] [right]
The Code
[f1] [f2] [f3] [f4] [f5] [f6] [shift] [optn] [vars] [menu] [up] [down] [left] [right] [alpha] [x2] [caret] [exit] [xot] [log] [ln] [sin] [cos] [tan] [abc] [fd] [pleft] [pright] [comma] [arrow] [7] [8] [9] [del] [ac] [4] [5] [6] [x] [divide] [1] [2] [3] [plus] [minus] [zero] [period] [exp] [negative] [exe] [ctrl] [esc]
Notice that only non-zero alphanumeric characters are allowed, so I had to name them accordingly.