#!/usr/local/bin/bash -norc

# Public domain notice for all NCBI EDirect scripts is located at:
# https://www.ncbi.nlm.nih.gov/books/NBK179288/#chapter6.Public_Domain_Notice   

awk -F '\t' -v 'OFS=\t' "/^$1\t/{a++}/^$2\t/{a++}a>0{print}a>1{exit}"
