pr -l 63 sqrt.scala            >sqrt.pr
pr -l 63 sqrt2.scala           >sqrt2.pr
pr -l 63 factorial.scala       >factorial.pr
pr -l 63 fibonacci.scala       >fibonacci.pr
pr -l 63 exponentiation.scala  >exponentiation.pr
pr -l 63 gcd.scala             >gcd.pr
pr -l 63 summation.scala       >summation.pr
pr -l 63 derivative.scala      >derivative.pr
chmod 644 *.scala *.pr