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if mxn<txi
mxl=i
mxn=txi
endif
if mnn>txi
mnl=i
mnn=txi
endif
endfor
thisform.label1.caption=str(mxl)
thisform.label2.caption=str(mxn)
thisform.label3.caption=str(mnl)
thisform.label4.caption=str(mnn)
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