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thanx,AJT,for all your answers. i tried to put "cardinal number" yesterday,but one clue crossing it,confused me. if you can correct that answer,then i can use"cardinal number".this other clue is,"usable without leaving car"D?D?E??.ORIGINALLY,I PUT "DRIVE-IN",AS IN DRIVE IN FACILITIES,WHICH RENDERED "CARDINAL NUMBER",AS MISFITTING. SORT THIS CAR RELATED ONE OUT,AND I CAN THEN USE "CARDINAL NUMBER",ALL THE BEST,KRISSTOFF.

Could it be RATIONAL NUMBER which would make your I correct in drive in?

Drive in seem correct, could be rational number rather than cardinal number.

Snap!

thanx,mazie and alchemist,you sorted out this situation very well,feel free to run the army(or the country!),thanx to both of you again,blessings,krisstoff.