<% if request.path =~ /\/html\/10?/ %>

<% else %>

<% end %>

<%= @section.upcase %> Tutorial

Page <%= @page %>/10

<%== erb "tutorial/#{@section}/#{@page}".to_sym, layout: false %>

<% if request.path =~ /\/html\/10?/ %> <% else %>

HTML

Try again: make sure you change Hello World to something else.

Site Preview

<% end %>