key1.=c(1, 2, 3)
key2.=c(2)

if (identical(key1.,key2.) == "TRUE")     {
                                                                                cat("No Errors found")
                                                                }

if (length(setdiff(key1., key2.)) !=0)    {
                                                                                cat("Reference.ID_Trial.ID_Arm.ID_SubArm.ID\n\n")
                                                                                cat(paste(setdiff(key1., key2.)), sep="\n")
                                                                                cat("Error Message: The above value is not found in key2.\n\n")
                                                                }
if (length(setdiff(key2., key1.)) !=0)        {
                                                                                cat("Reference.ID_Trial.ID_Arm.ID_SubArm.ID\n\n")
                                                                                cat(paste(setdiff(key2., key1.)), sep="\n")
                                                                                cat("Error Message: The above value is not found in key1.\n\n")
                                                                }
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