Remove Brackets

Hi all,

i have a question in prolog

how can i remove the brackets which is printed while im using the rules.

i.e suppose my rule is like following



do(do(cal1,cal2)--> cal1(Cal1), cal(Cal2).

cal1(cal1(X,Y))-->
               x(X,Num),
               n(N,Num).


and there is a defintion for n and x
when it print the result it keeps the brackets(cal1(cal2(.. (..) ..)..)..) w
ithin the output result 

any idea to remove these barckets??????