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The phrase "are several levels of" is correct and usable in written English.
It can be used when discussing different tiers, stages, or categories within a particular context or subject matter.
Example: "In the hierarchy of management, there are several levels of authority that dictate decision-making processes."
Alternatives: "there are multiple tiers of" or "there are various stages of".
Exact(33)
There are several levels of refinement to this analysis.
There are several levels of this software, and all give excellent audio editing capabilities.
There are several levels of autonomy, going in stages from driver assistance to full automation.
There are several levels of administrative units below the district level.
NOTE: There are several levels of stairs leading to this entrance.
In between these extremes are several levels of placement that are meant to assist students with differing levels of disability.
Similar(27)
Prior to statistical analysis of a scanned slide, there needs to be several levels of normalization to account for the variability inherent in spotted microarray experiments.
It also noted that although there were several levels of review for chimpanzee experiments, "no uniform set of criteria" were used by NIH to assess their necessity.
To obtain both the European and UK qualifications will generally take a minimum of 4 years working under the guidance of a fully qualified attorney, during which time there will be several levels of rigorous exams to sit.
Its basic unit was the cell, above which there were several levels of administration, including provincial, regional and central committees.
First, there might be several levels of effectiveness and by using only two levels, our analysis is very rough.
More suggestions(16)
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are different levels of
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are several classes of
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are several types of
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com