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a. Barriers: Crataegus coccinea Picea excelsa Scarlet-fruited Thorn Norway Spruce Hippophae rhamnoides Rhamnus cathartica Sea Buckthorn Common Buckthorn Juniperus virginiana Ribes alpinum Red Cedar Alpine Currant Lonicera tatarica Ribes oxycanthoides Tartarian Honeysuckle Wild Gooseberry |
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