Intersection problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg125962] Intersection problem*From*: Cisco Lane <travlorf at yahoo.com>*Date*: Tue, 10 Apr 2012 02:27:28 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

I need to select out the elements of the first list whose first elements are contained in the second list. For example first list: {{a,x},{b,y},{c,z}} second list: {b,c,d} result: {{b,y},{c,z}} Is there a quick way to do this? Intersection, maybe somehow?

**Follow-Ups**:**Re: Intersection problem***From:*Barrie Stokes <Barrie.Stokes@newcastle.edu.au>

**Re: Intersection problem***From:*Christoph Lhotka <christoph.lhotka@fundp.ac.be>

**Re: Intersection problem***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: Intersection problem***From:*Adriano Pascoletti <adriano.pascoletti@uniud.it>

**Re: Intersection problem***From:*"Harvey P. Dale" <hpd1@nyu.edu>

**Re: Intersection problem***From:*Fred Simons <f.h.simons@tue.nl>