
exception words
system throws: - stack underflow / invalid memory access [sigbus] 
-4 /Y/ 0  -9 /Y/ 0  3 /Y/ 0  
throw inside evaluate: - catched on commandline / inside a word 
3 /Y/ 0  3 /Y/ 0  
sigbus inside evaluate: - catched on commandline / inside a word 
-9 /Y/ 0  -9 /Y/ 0  
evaluate catch 
/Y/ 0 