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Extra Credit builds an outline of arrow's docs the first time your work uses it. Until then, start at the official documentation.

• assertthat Easy Pre and Post Assertions
• R.oo R Object-Oriented Programming with or without References
• shinystan Interactive Visual and Numerical Diagnostics and Posterior Analysis for Bayesian Models
• reticulate Interface to 'Python'
• lattice Trellis Graphics for R
• svglite An 'SVG' Graphics Device
• jpeg Read and write JPEG images
• sessioninfo R Session Information
• mnormt The Multivariate Normal and t Distributions, and Their Truncated Versions
• covr Test Coverage for Packages
• deSolve Solvers for Initial Value Problems of Differential Equations ('ODE', 'DAE', 'DDE')
• GPArotation Gradient Projection Factor Rotation