English translation for ancestor/2 and descendant/2 updated.

1 files changed, 9 insertions, 5 deletions

diff --git a/prolog/problems/family_relations/ancestor_2/en.py b/prolog/problems/family_relations/ancestor_2/en.py
index 322ab92..8e253bd 100644
--- a/prolog/problems/family_relations/ancestor_2/en.py
+++ b/prolog/problems/family_relations/ancestor_2/en.py
@@ -2,7 +2,8 @@ name = 'ancestor/2'
 slug = 'the ancestor relation'
 
 description = '''\
-<p><code>ancestor(X, Y)</code>: <code>X</code> is an ancestor (parent, grandparent, grandgrandparent, ...) of <code>Y</code>.</p>
+<p><code>ancestor(X, Y)</code>: <code>X</code> is an ancestor (parent, grandparent, great-grandparent, ...)
+of <code>Y</code>.</p>
 <pre>
 ?- ancestor(patricia, X).
   X = john ;
@@ -15,13 +16,16 @@ described with predicates <code>parent/2</code>, <code>male/1</code>, and
 '''
 
 plan = ['''\
-<p>It's time to use recursion for the first time... how can we transpose the problem to a smaller one (a single step smaller that is)?</p>
-<p><img src="[%@resource Prolog_ancestor_03.svg%]" alt="A parent of someone, who is a parent of Y, is also an ancestor of Y." /></p>
+<p>It's time to use recursion for the first time... how can we transpose the problem to a smaller one
+(a single step smaller that is)?</p>
+<p><img src="[%@resource Prolog_ancestor_03.svg%]" alt="A parent of someone, who is a parent of Y,
+is also an ancestor of Y." /></p>
 ''', '''\
 <p>If <code>X</code> is a parent of some <code>Z</code> and that <code>Z</code> is an ancestor of <code>Y</code>,
 then <code>X</code> is also an ancestor of <code>Y</code>.</p>
 ''', '''\
-<p><img src="[%@resource Prolog_ancestor_04.svg%]" alt="If X is a parent of Z, and Z is an ancestor of Y, then X is also an ancestor of Y." /></p>
+<p><img src="[%@resource Prolog_ancestor_04.svg%]" alt="If X is a parent of Z, and Z is an ancestor of Y,
+then X is also an ancestor of Y." /></p>
 ''']
 
 hint = {
@@ -63,7 +67,7 @@ one another -- assigned values to variables in one branch do not transfer to the
 
     'only_two_levels_deep': '''\
 <p>Your solution is not general enough. An ancestor can also be someone "more steps away" than grandparents,
-e.g. grandgrandparents or grandgrandgrandparents are also ancestors.</p>
+e.g. great-grandparents or great-great-grandparents are also ancestors.</p>
 ''',
 
     'descendant_need_not_be_parent': '''\