TRADING
demands (prod.)
items
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
 |
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| DEMANDS (PROD.) |
|
|
 |
items |
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other demands |
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| TRADING |
|
|
|
offers (products) |
|
|
demands (prod.) |
|
|
|
|
A = 0 >> E |
||
 |
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| equipments |
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