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Example check file:
---------------------------------- first.chk ----------------------------------
* revised first.chk file for definitions of dataentry and calculation
LABELBLOCK
     LABEL sex
         1 Male
         2 Female
     END
     LABEL string
         OD Odense
         BLT Baltimore
         REY "Reykjavik Iceland"
         SID Sidney
         NDH "New Delhi"
         MOM Mombassa
         BUE "Buenos Aires"
     END
END

ID
     * This will show the value of ID from the record entered on the statusbar
     type statusbar "id= " Green
end

V1
     * comment legal defines legal values and type comment writes the text on screen
     COMMENT LEGAL USE sex
     TYPE COMMENT
END

V2
     * restricted dataentry to values in range 1.0-2.10 and value 9
     RANGE 1.0 2.10
     LEGAL
     9
     END
END

V3
     AFTER ENTRY
     BMI=v3/(v2^2)
     END
END

BMI
     NOENTER
END

V4
     AFTER ENTRY
     AGE=trunc((t1-v4)/365.25)
     END
END

AGE
     NOENTER
END

S2
     COMMENT LEGAL USE string
     TYPE COMMENT
END
---------------------------------- first.chk ----------------------------------
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