Find the the relationship between the entities cloud peak energy inc and bnsf.
The different possibilities are:
0: no_relation
6: org:org:acquired_by
15: org:org:subsidiary_of
16: org:org:shares_of
20: org:org:agreement_with
current expectations of limited or no shipments into the Asian market over the next several years , as demonstrated by the recent amendments to CLOUD PEAK ENERGY INC . throughput agreements with Westshore and BNSF in the fourth quarter of 2015 , CLOUD PEAK ENERGY INC . chief operating decision maker began evaluating segment operating performance using Adjusted EBITDA , excluding an allocation of corporate costs . Provide response in all capital letters, no lowercase letters allowed.
user