co1=d1 is/are anterior (zootomy)/cranial/cephalic (anatomy)/superior (human anatomy) with frame-of-reference body/object cl1=d3.
Standard anatomical term to avoid ambiguity, but not restricted to anatomical objects. In most animals the same as the front (=craraipau), but in humans the same as the top (=gapraipau). See also anterior/superior end (claco'u), anterior/superior relative position (claco'umau), posterior/inferior end (claco'a), anteroposterior (A-P) axis (selcla), ventral/anterior end (befco'u), dorsal/posterior end (tolbefco'u/bekpyco'u).