diff --git a/alib2data/src/tree/ranked/PrefixRankedBarPattern.h b/alib2data/src/tree/ranked/PrefixRankedBarPattern.h
index 4f2a92696b690f303020d7c7bcd0098f223d14e0..b7b1851db236cf737b5dd4dac618148f9248d2f5 100644
--- a/alib2data/src/tree/ranked/PrefixRankedBarPattern.h
+++ b/alib2data/src/tree/ranked/PrefixRankedBarPattern.h
@@ -27,7 +27,6 @@ class PrefixRankedBarPattern;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>
diff --git a/alib2data/src/tree/ranked/PrefixRankedBarTree.h b/alib2data/src/tree/ranked/PrefixRankedBarTree.h
index 72d1083840eaca4c51bd0ffbe2c8573592de5044..1f01f88dd7ce2c1550dd6b37b1854de88cc218ba 100644
--- a/alib2data/src/tree/ranked/PrefixRankedBarTree.h
+++ b/alib2data/src/tree/ranked/PrefixRankedBarTree.h
@@ -27,7 +27,6 @@ class PrefixRankedBarTree;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>
diff --git a/alib2data/src/tree/ranked/PrefixRankedExtendedPattern.h b/alib2data/src/tree/ranked/PrefixRankedExtendedPattern.h
index c1b729920a29d8bd776a0b0e29987360d0dc0132..5dfa6d2b6b5d192fa5caaedb7ecf7bf12c3a6ed1 100644
--- a/alib2data/src/tree/ranked/PrefixRankedExtendedPattern.h
+++ b/alib2data/src/tree/ranked/PrefixRankedExtendedPattern.h
@@ -27,7 +27,6 @@ class PrefixRankedExtendedPattern;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>
diff --git a/alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h b/alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h
index c806b2c076de62a6aa27570a611505e9258038fc..6ec2663a2aaeedc7d0d1edc056ed1bb0736d0fa9 100644
--- a/alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h
+++ b/alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h
@@ -27,7 +27,6 @@ class PrefixRankedNonlinearPattern;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>
diff --git a/alib2data/src/tree/ranked/PrefixRankedPattern.h b/alib2data/src/tree/ranked/PrefixRankedPattern.h
index 7d80ffb275397add920c6f2c6005a2544303de7b..9adf9c68187c05daca6e882c0cbe6b2e95215139 100644
--- a/alib2data/src/tree/ranked/PrefixRankedPattern.h
+++ b/alib2data/src/tree/ranked/PrefixRankedPattern.h
@@ -27,7 +27,6 @@ class PrefixRankedPattern;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>
diff --git a/alib2data/src/tree/ranked/PrefixRankedTree.h b/alib2data/src/tree/ranked/PrefixRankedTree.h
index a33029aa3aa6166c8b8a0ab846ac28feebf99c3f..519705f69242fd099a806d5d77a32da091e95e62 100644
--- a/alib2data/src/tree/ranked/PrefixRankedTree.h
+++ b/alib2data/src/tree/ranked/PrefixRankedTree.h
@@ -27,7 +27,6 @@ class PrefixRankedTree;
 
 } /* namespace tree */
 
-
 #include <ext/algorithm>
 
 #include <alib/set>