```ruby
require 'active_support/inflector'

ActiveSupport::Inflector.inflections do |inflect|
  inflect.clear

  inflect.plural(/$/, 's')
  inflect.plural(/([sxz]|[cs]h)$/i, '\1es')
  inflect.plural(/([^aeiouy]o)$/i, '\1es')
  inflect.plural(/([^aeiouy])y$/i, '\1ies')

  inflect.singular(/s$/i, '')
  inflect.singular(/(ss)$/i, '\1')
  inflect.singular(/([sxz]|[cs]h)es/, '\1')
  inflect.singular(/([^aeiouy]o)es$/, '\1')
  inflect.singular(/([^aeiouy])ies$/i, '\1y')

  inflect.irregular('child', 'children')
  inflect.irregular('person', 'people')
  inflect.irregular('self', 'selves')

  inflect.uncountable(%w(series))
end
```

Fix the singular inflection for sibilant sounds.
user
```ruby
require 'active_support/inflector'

ActiveSupport::Inflector.inflections do |inflect|
  inflect.clear

  inflect.plural(/$/, 's')
  inflect.plural(/([sxz]|[cs]h)$/i, '\1es')
  inflect.plural(/([^aeiouy]o)$/i, '\1es')
  inflect.plural(/([^aeiouy])y$/i, '\1ies')

  inflect.singular(/s$/i, '')
  inflect.singular(/(ss)$/i, '\1')
  inflect.singular(/([sxz]|[cs]h)es$/, '\1')
  inflect.singular(/([^aeiouy]o)es$/, '\1')
  inflect.singular(/([^aeiouy])ies$/i, '\1y')

  inflect.irregular('child', 'children')
  inflect.irregular('person', 'people')
  inflect.irregular('self', 'selves')

  inflect.uncountable(%w(series))
end
```
assistant