added worker_group;
fork: default to subgroup of worker_group;
removed obsolete fork_local;
join/get_result: cumulative flattened exceptions;
map: subgroup of worker_group;
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\def\isabellecontext{Base}%
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\endisadelimtheory
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\isatagtheory
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\ Base\isanewline
\isakeyword{imports}\ Pure\isanewline
\isakeyword{uses}\ {\isachardoublequoteopen}{\isachardot}{\isachardot}{\isacharslash}{\isachardot}{\isachardot}{\isacharslash}antiquote{\isacharunderscore}setup{\isachardot}ML{\isachardoublequoteclose}\isanewline
\isakeyword{begin}\isanewline
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\endisatagtheory
{\isafoldtheory}%
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\isadelimtheory
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\endisadelimtheory
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