use more meaningful iteration variable name
use more meaningful iteration variable name


Former-commit-id: f1a799ad602fafc089bdcf42545e92454a3cc1d3 [formerly f1a799ad602fafc089bdcf42545e92454a3cc1d3 [formerly 7e39d006c41e282aae6d68859242f7c3e1697af6]]
Former-commit-id: 448fccc7ef214a349c275f067db190143313fd49
Former-commit-id: 877ac9f36614c184ae0a49123db714fc4f22b0ae
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine