disagg/subsets: documented the code
disagg/subsets: documented the code


Former-commit-id: de5001f197bcb6cae2c2b4df27107cd66b4752ad [formerly 88385651090632ab995a70b801d506df180ffd1e]
Former-commit-id: edd8c37c83aacc3f8ad7302adb0676a609e137c7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine