<< o1 o2 lt r1  >> or  <<  o1 o2 gt r1 >> or <<  o1 o2 gt r1 >>
integer r1;
These premitives compare objects o1 and o2.
[lt (less than), gt (greater than), eq (equal)]
The result is r1 which is integer object.
Here, 1 means true and 0 means false.
Example:  (abc) (bca) eq ::  ===> 0

Nobuki Takayama 2020-11-24