multiple expressions are possible + fixes to silly things
multiple expressions are possible + fixes to silly things

anfedorov/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line,anfedorov/data-science-at-the-command-line