Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’
Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’
Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’
Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’
Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’
Invalid package aliases in Rd file 'perspective-package.Rd':
  'perspective-package'
Invalid package aliases in Rd file 'perspective-package.Rd':
  ‘perspective-package’