(SoapUI freeVersion) For loop in groovy.

Help please.

(SoapUI freeVersion) For loop in groovy to make a data loop. But only one value ( last cell value) is taken.

for( x=1 ; x<sizeR ; x++)
 {
 bucket=sheet1.getCell(1,x).getContents()
 log.info bucket 
 propTestStep.setPropertyValue("bucket",bucket) 
 }