SimilarityRank
many_challenge 0.731 34197
challenge 0.678 222
different_challenge 0.670 83598
specific_challenge 0.665 92340
these_challenge 0.659 16957
challenge_face 0.626 32972
face_many_challenge 0.619 78198
face_challenge 0.619 51525
major_challenge 0.617 94021
current_challenge 0.616 50315
challenge_they_face 0.608 44286
the_challenge_face 0.607 22143
the_key_challenge 0.607 74955
the_major_challenge 0.606 66525
the_challenge_face_by 0.604 42818
challenge_relate_to 0.603 80453
new_challenge 0.601 18398
challenge_associate_with 0.596 61107
challenge_face_by 0.589 66867
the_unique_challenge 0.588 90230
great_challenge 0.583 59535
the_main_challenge 0.582 52376
the_challenge_pose_by 0.581 96527
obstacle 0.576 6103
various_problem 0.576 94278