You can now change the sentence you want to start at. Resolves #3.

app/src/main/java/ch/ralena/natibo/fragment/CoursePickSentenceFragment.java

@@ -154,6 +154,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
 	}
 
 	private void setStartingSentence() {
+		course.setStartingSentenceForAllSchedules(realm, curSentence);
 		getActivity().onBackPressed();
 	}
 

app/src/main/java/ch/ralena/natibo/object/Course.java

@@ -57,6 +57,7 @@ public class Course extends RealmObject {
 	private int pauseMillis;
 	private RealmList<Day> pastDays = new RealmList<>();
 	private RealmList<Schedule> schedules = new RealmList<>();    // the different pieces that make up the study routine for each day
+	private RealmList<Sentence> sentencesSeen = new RealmList<>();    // keep track of which sentences have been seen and which haven't
 
 	// --- getters and setters ---
 
@@ -148,6 +149,15 @@ public RealmList<Schedule> getSchedules() {
 
 	// --- helper methods ---
 
+	public void setStartingSentenceForAllSchedules(Realm realm, Sentence sentence) {
+		// remember, the sentence index starts at 1, not 0!
+		realm.executeTransaction(r -> {
+			for (Schedule schedule : schedules) {
+				schedule.setSentenceIndex(sentence.getIndex() - 1);
+			}
+		});
+	}
+
 	public void addReps(int reps) {
 		numReps += reps;
 	}
@@ -206,6 +216,7 @@ public void prepareNextDay(Realm realm) {
 	private RealmList<Sentence> getSentences(int index, int numSentences, RealmList<Pack> packs) {
 		RealmList<Sentence> sentences = new RealmList<>();
 
+		// go through each pack
 		for (Pack pack : packs) {
 			RealmList<Sentence> packSentences = pack.getSentences();
 			if (index >= pack.getSentences().size())

app/src/main/res/layout/fragment_sentence_list.xml

@@ -11,7 +11,8 @@
 	<SeekBar
 		android:id="@+id/seekbar"
 		android:layout_width="match_parent"
-		android:layout_height="wrap_content"/>
+		android:layout_height="wrap_content"
+		android:layout_marginLeft="16dp"/>
 
 	<android.support.v7.widget.RecyclerView
 		android:id="@+id/recyclerView"