ÿÿÿÿp¦òH: elasticity  c. c  @Ä}@Ð;@Ðå@Î<@ÉU@ÐÛ@Ê,@Ë&@ÊŸ@Éæ@Ì@ÆÚ@Î7@Ñl@Ë{@ÌÔ