[Jprogramming] J Challenge

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With Elvex & Raul's help we have...

   (~.@{.,.<@(;:inv)/./) list2

┌────┬─────────────────────────┐

│bird│one eight fourteen       │

├────┼─────────────────────────┤

│cow │two three five six seven │

├────┼─────────────────────────┤

│dog │four nine eleven thirteen│

├────┼─────────────────────────┤

│cat │ten                      │

├────┼─────────────────────────┤

│pig │twelve fifteen           │

└────┴─────────────────────────┘

As Raul points out, comma with spaces are a bit more work, particularly if
you must leave off a comma after the last ID in the list. So what would be
the the verb for this?

┌────┬─────────────────────────────┐

│bird│one, eight, fourteen         │

├────┼─────────────────────────────┤

│cow │two, three, five, six, seven │

├────┼─────────────────────────────┤

│dog │four, nine, eleven, thirteen │

├────┼─────────────────────────────┤

│cat │ten                          │

├────┼─────────────────────────────┤

│pig │twelve, fifteen              │

└────┴─────────────────────────────┘

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