Sort three numbers X20321

Statement

Design a function @ordena3(a, b, c)@ which, given three values returns them sorted. This function must be solved with all necessary if analyzing all possible cases: when $a$ is greater than $b$ and $c$ , when $b$ is greater than $a$ and $c$ , and so on.
Design a function @ordena2(a, b)@ that given two values returns them sorted.
Design a function @ordena3_2a2(a, b, c)@ that given three values returns them sorted. This function cannot contain any if and must be solved calling function @ordena2(a, b)@ from previous point.

Scoring

The first two points are worth 30 points. The last one is worth 40 points.

Sample session

>>> ordena3('c', 'b', 'a')
('a', 'b', 'c')
>>> ordena3(1, 2, 1)
(1, 1, 2)
>>> ordena2('d', 'b')
('b', 'd')
>>> ordena2(1, 1)
(1, 1)
>>> ordena3_2a2('c', 'b', 'a')
('a', 'b', 'c')
>>> ordena3_2a2(1, 2, 1)
(1, 1, 2)

Information

Author: InfBesos
Language: English
Translator
Original language: Catalan
Other languages: Catalan Spanish
Official solutions: Python
User solutions: Python