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  1. USING: io kernel math math.parser ;
  2.  
  3. 1
  4. 5 [ dup dup + ] times
  5. 5 [ println ] times
  6.  
Runtime error #stdin #stdout 0.18s 159232KB
stdin
Standard input is empty
stdout
./prog.factor

5: 5 [ println ] times 
              ^
No word named “println” found in current vocabulary search path