third.erl

-module(third).
-export([xor_1/2,xor_2/2,xor_3/2,max_three/3,how_many_equal/3]).

% '=/=' and '==' are the operations for inequality and equality in Erlang
xor_1(X,Y) ->
	(X =/= Y)
.

% 'not' is the Erlang negation function
xor_2(X,Y) ->
	not (X == Y)
.

% 'and' and 'or' are the Erlang conjunction and disjunction (infix) operators.
xor_3(X,Y) ->
	(X =/= Y) and (X or Y)
.

max_three(X,Y,Z) ->
   max(max(X, Y), Z)
.

% I had to peek for howManyEqual
% Don't know enough of Erlang to do any "smart" logic
% Specifically how to get stacks working

how_many_equal(X,X,X) -> 3;
how_many_equal(X,_,X) -> 2;
how_many_equal(X,X,_) -> 2;
how_many_equal(_,X,X) -> 2;
how_many_equal(_,_,_) -> 0.