First generate the log series of Imports, GNP and CPI by typing the
"genr lnimport = log import", "genr lnGNP = log gnp" and "genr lnCPI = log cpi"
into the command line.  And then use "Estimate Equation" from the "Quick" option
, typing "lnimport c lngnp lncpi" into the dialog box.
And here are the results:

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