acquiring, from the product information storage unit, {HEAD ~ color information} on {TAIL ~ related products} that differ in color from the products 
acquiring , from the product information storage unit , { HEAD ~ color information } on { TAIL ~ related products } that differ in color from the products
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH