sha,message,author_date,committer_date,raw_author,raw_committer,repo,author,committer
ba9f82227a9ec0c42928d5d0b978b101eda756cb,"Modify code in ""Grouped arithmetic"" (#3904)

`results.append(group - alt.sel(x=label))` changed to:
`results.append(group - alt.sel(letters=label))`",2020-04-05T19:52:27Z,2020-04-05T19:52:27Z,4138efe426d27df6c39c0c21c04ff5e01830abf7,cd792325681cbad9f663f2879d8b69f1edbb678f,13221727,9200184,19864447