with Unix line endings. Each line should be:
commodity stallname buyprice buyqty sellprice sellqty
with tabs in between each item. This is just as the data
- appears in the Puzzle Pirates trade commodities interfance.
+ appears in the Puzzle Pirates trade commodities interface.
If there is no buy offer, or no sell offer, supply empty
strings. Where the YPP client says `>1000', pass exactly
that string.