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Group shelter wood system means:
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| [A]. |
If canopy is opened out evenly in making regeneration felling | [B]. |
If the canopy is opened out by creating scaltered gaps which are subsequently extended over the whole area
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| [C]. |
If the canopy is opened out gradually and irregularly with a long regeneration period, resulting in a more uneven aged forest | [D]. |
None of these |
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