(*
    Exercise 2-14 from Functional Programming Using F#
    Copyright (c) 2016 Răzvan Mocanu

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*)

let isLowerCaseVowel c =
    c = 'a' || c = 'e' || c = 'i' || c = 'o' || c = 'u' || c = 'y'

let isLowerCaseConsonant c =
    c = 'y' || System.Char.IsLower c && not (isLowerCaseVowel c)
