Command relevant to interlingua-based translation applications which use backtranslation (cf. Section~\ref{Section:Backtranslation}). The assumption is that translation is from Source to Interlingua, and backtranslation is thus from Interlingua to Source.

The argument to the command should be an output file produced by doing {\tt TRANSLATE\_\-CORPUS} (cf. Section~\ref{Section:TRANSLATE--CORPUS}) in the Source $\rightarrow$ Source environment. The command is however run in the Source $\rightarrow$ Interlingua environment. The intent is to check that the result of backtranslation is an expression which, when parsed in the Source language and translated back into Interlingua, would produce the same Interlingua representation as the one produced by performing the Source $\rightarrow$ Source translation. Examples which fail to give a match are flagged.