The ICO contract for an externally-deployed free-mint token that we built.
-No own token. It does not mint anything. Instead it holds an inventory of an external alkane (e.g. a free-mint instance spawned from template 4:797) and transfers from that inventory at Buy time.
-DIESEL refund. If a buyer attaches more DIESEL than the price requires (e.g. because their wallet picked a 10-DIESEL UTXO to spend 1 DIESEL), the excess is refunded in the same Buy transaction.
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alkanes#