for FILE in l1o24-s1.html l1o35-s13.html l1o35-s20.html l1o35-s4.html \
	l1o23.html l1o24-s2.html l1o35-s14.html l1o35-s21.html l1o35-s5.html \
	l1o23-s1.html l1o24-s3.html l1o35-s15.html l1o35-s22.html l1o35-s6.html \
	l1o23-s2.html l1o24-s4.html l1o35-s16.html l1o35-s23.html l1o35-s7.html \
	l1o23-s3.html l1o35.html l1o35-s17.html l1o35-s24.html l1o35-s8.html \
	l1o23-s4.html l1o35-s10.html l1o35-s18.html l1o35-s25.html l1o35-s9.html \
	l1o23-s5.html l1o35-s11.html l1o35-s19.html l1o35-s2.html \
	l1o24.html l1o35-s12.html l1o35-s1.html l1o35-s3.html
do
        echo $FILE
        sed 's/to problem 3/to problem l1o35/g
          ' < $FILE > $$tmp
	mv $$tmp $FILE
done