[Icfp04-discuss] function clear_marker_at(p:pos, c:color, i:marker) ??

[Jirka Schuppe]

Hi all,

i don't understand the parameter i in function clear_marker_at(p:pos,
c:color, i:marker)

It means:
 function clear_marker_at(p:pos, c:color, i:marker) =
   <clear marker i of color c in cell p>

to identify a marker, i need only p and c. I unserstand the function
"clear_marker_at" to set the marker at position p and color c to zero. Why i
need then parameter i ??

Thanx