| -snes_fas_levels | - The number of levels
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| -snes_fas_cycles<1> | - The number of cycles -- 1 for V, 2 for W
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| -snes_fas_type<additive,multiplicative,full,kaskade> | - Additive or multiplicative cycle
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| -snes_fas_galerkin<PETSC_FALSE> | - Form coarse problems by projection back upon the fine problem
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| -snes_fas_smoothup<1> | - The number of iterations of the post-smoother
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| -snes_fas_smoothdown<1> | - The number of iterations of the pre-smoother
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| -snes_fas_monitor | - Monitor progress of all of the levels
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| -snes_fas_full_downsweep<PETSC_FALSE> | - call the downsmooth on the initial downsweep of full FAS
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| -fas_levels_snes_ | - SNES options for all smoothers
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| -fas_levels_cycle_snes_ | - SNES options for all cycles
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| -fas_levels_i_snes_ | - SNES options for the smoothers on level i
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| -fas_levels_i_cycle_snes_ | - SNES options for the cycle on level i
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| -fas_coarse_snes_ | - SNES options for the coarsest smoother
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