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Generally , about 100 sound seeds are required to establish each seedling , although this number varies considerably depending on seedbed condition , seed year , and environmental factors ( 73 ) . The time it takes for USCIS to process an application for work authorization varies considerably depending on the region of the United States in which the application is processed . The appropriateness of a consumer 's seating and mobility system varies considerably depending on the competence , proficiency , and experience of the professionals assisting the user . The results of these walks would vary considerably depending on who was doing the retelling . In addition , the economic situation of immigrants may vary considerably depending on how long they have been here . This plan will vary considerably depending on the type of materials used as well as the differences in the manufacturing processes . On average , congestion costs per mile are about five times greater in urban areas than in rural areas , but this can vary considerably depending on traffic volumes on particular highways .