Version

Packages must be loaded in a proper version of kan/sm1.
It can be checked as follows.
Example:  
   /factor-a.version (2.981101) def
   factor-a.version [(Version)] system_variable gt 
   { (This package requires the latest version of kan/sm1) message
     (Please get it from http://www.math.kobe-u.ac.jp/KAN) message
     error
   } { } ifelse