cat cities_true_false.csv > cieacf_true_false.csv
sed 1d inventions_true_false.csv >> cieacf_true_false.csv
sed 1d elements_true_false.csv >> cieacf_true_false.csv
sed 1d animals_true_false.csv >> cieacf_true_false.csv
sed 1d companies_true_false.csv >> cieacf_true_false.csv
sed 1d facts_true_false.csv >> cieacf_true_false.csv