     l want to create a  column of 1 and 2 randomly what command should l use 
  eg
  treatment          strata
      
  1                      1
  2                      0
  1                      1
  2                      1
  2                      0          
  2                      1
  2                      0
  1                      0
  these should be created randomly
  
  secondly if l have something like 
  for (i in 1:n ) df =c(1,rexp(1,.001),rexp(1,.002)) can l add an if statement in  side the c maybe to compare the 2 exponential  numbers to create  another  variable
    
       
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