diff --git a/project/build.properties b/project/build.properties
index ea58cf0..e71780d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.1.+
+sbt.version = 1.2.6
\ No newline at end of file

diff --git a/project/build.properties b/project/build.properties
index ea58cf0..e71780d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.1.+
+sbt.version = 1.2.6
\ No newline at end of file
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 6612baf..b8f0659 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.+")
+addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.3")

diff --git a/project/build.properties b/project/build.properties
index ea58cf0..e71780d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.1.+
+sbt.version = 1.2.6
\ No newline at end of file
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 6612baf..b8f0659 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.+")
+addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.3")
diff --git a/src/main/scala/org/xcit/nback/markov/models/NBackSequence b/src/main/scala/org/xcit/nback/markov/models/NBackSequence
new file mode 100644
index 0000000..c79a786
--- /dev/null
+++ b/src/main/scala/org/xcit/nback/markov/models/NBackSequence
@@ -0,0 +1,6 @@
+package org.xcit.nback.markov.models
+
+class NBackSequence(
+                     N: Int,
+                     length: String,
+                   ) {}