Need a functional process for this.

*To*: mathgroup at smc.vnet.net*Subject*: [mg55589] Need a functional process for this.*From*: Steve Gray <stevebg at adelphia.net>*Date*: Wed, 30 Mar 2005 03:22:03 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I have two lists, aa and bb. aa has the general form {2,5,7,9,11,...} (or{{2},{5},{7},{9},{11},?}}), and bb has the general form {{6,4},{9,2},{5,6},{3,8},?}. If either the first or second element in any sublist (pair of integers) of bb matches any element in aa, I want to delete that sublist from bb. In the above example, neither member of {6,4} or {3,8} belongs to aa, while at least one element of {9,2} and {5,6} belongs to aa, so bb becomes {{6,4},{3,8}}. If aa had only one element, for example 7, I could do bb=Delete[bb,Position[bb,{x_,7}|{7,y_}]], but I don't know how to do it for several values instead of just "7" without using a procedural loop. What is a good functional way to do this? Thank you for any tips. Steve Gray

**Follow-Ups**:**Re: Need a functional process for this.***From:*János <janos.lobb@yale.edu>

**Re: Need a functional process for this.***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>