diff --git a/assets/languages/dictionaries/en-utf8.csv b/assets/languages/dictionaries/en-utf8.csv
index 6c2d04d1..f7614e94 100644
--- a/assets/languages/dictionaries/en-utf8.csv
+++ b/assets/languages/dictionaries/en-utf8.csv
@@ -4,7 +4,6 @@
 'll
 're
 've
-I
 abs	62
 cia	118
 co
diff --git a/assets/languages/dictionaries/es-utf8.csv b/assets/languages/dictionaries/es-utf8.csv
index f8d9a0d9..51512c84 100644
--- a/assets/languages/dictionaries/es-utf8.csv
+++ b/assets/languages/dictionaries/es-utf8.csv
@@ -1540,7 +1540,6 @@ Bélgica	116
 Bétera
 Bóntoc
 Búrbura
-C
 CD
 CFE
 CNDH
@@ -4020,7 +4019,6 @@ Fátima
 Félix	111
 Fómeque
 Fúquene
-G
 GPS
 Gabaldón
 Gaban
@@ -4858,7 +4856,6 @@ Huépil
 Hábita
 Héctor
 Héroes	118
-I
 IMSS	89
 INE	124
 INEGI	100
@@ -6829,7 +6826,6 @@ Múgica
 Múnera
 Mútis
 Múzquiz
-N
 NIF
 Naaguán
 Naborot
@@ -7106,7 +7102,6 @@ Nísperos	60
 Nóvita
 Núcleo	138
 Núñez
-O	184
 ONG
 ONU
 Oasis	101
@@ -7340,7 +7335,6 @@ Ozuluama
 Ozumba
 Ozámiz
 Oñate
-P
 PEMEX
 Pabellón	117
 Pabla
@@ -8519,7 +8513,6 @@ Quiñota
 Quíbor
 Quícharo
 Quípama
-R
 RAE	92
 Rabanedo
 Rabolargo
@@ -8804,7 +8797,6 @@ Rímac	80
 Río	159
 Ríos	139
 Rómulo
-S
 SAT
 SEDENA
 SEP
@@ -11117,7 +11109,6 @@ Yáñez
 Yécora
 Yésica
 Yólox
-Z
 Zaachila
 Zabache
 Zabaleta
diff --git a/build.gradle b/build.gradle
index ff109092..2d516bba 100644
--- a/build.gradle
+++ b/build.gradle
@@ -131,7 +131,7 @@ static def validateDictionaryWord(String word, int lineNumber, String validChara
 		errors += "${errorMsgPrefix}. Found a garbage word: '${word}' on line ${lineNumber}.\n"
 	}
 
-	if (word.matches("^.\$") && !Character.isUpperCase(word.charAt(0))) {
+	if (word.matches("^.\$")) {
 		errorCount++
 		errors += "${errorMsgPrefix}. Found a single letter: '${word}' on line ${lineNumber}. Only uppercase single letters are allowed. The rest of the alphabet will be added automatically.\n"
 	}
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 56659433..4e6258d4 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -13,7 +13,7 @@
 
 	<string name="add_word_add">Add</string>
 	<string name="add_word_blank">Blank word not added.</string>
-	<string name="add_word_exist">Word \"%1$s\" already in the dictionary.</string>
+	<string name="add_word_exist">Word \"%1$s\" is already in the dictionary.</string>
 	<string name="add_word_invalid_language" translatable="false">Cannot add a word when no language is selected.</string>
 	<string name="add_word_title">Add Word</string>
 	<string name="add_word_field_placeholder">Type a word…</string>
diff --git a/src/io/github/sspanak/tt9/db/DictionaryDb.java b/src/io/github/sspanak/tt9/db/DictionaryDb.java
index 042332ee..40de59d2 100644
--- a/src/io/github/sspanak/tt9/db/DictionaryDb.java
+++ b/src/io/github/sspanak/tt9/db/DictionaryDb.java
@@ -101,15 +101,6 @@ public class DictionaryDb {
 	}
 
 
-	public static boolean doesWordExistSync(Language language, String word) {
-		if (language == null || word == null || word.equals("")) {
-			return false;
-		}
-
-		return getInstance().wordsDao().doesWordExist(language.getId(), word) > 0;
-	}
-
-
 	public static void deleteWords(Runnable notification) {
 		deleteWords(notification, null);
 	}
diff --git a/src/io/github/sspanak/tt9/db/DictionaryLoader.java b/src/io/github/sspanak/tt9/db/DictionaryLoader.java
index 084eaa1f..fb063bfc 100644
--- a/src/io/github/sspanak/tt9/db/DictionaryLoader.java
+++ b/src/io/github/sspanak/tt9/db/DictionaryLoader.java
@@ -10,6 +10,7 @@ import java.io.InputStreamReader;
 import java.io.LineNumberReader;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Locale;
 
 import io.github.sspanak.tt9.ConsumerCompat;
 import io.github.sspanak.tt9.Logger;
@@ -168,11 +169,11 @@ public class DictionaryLoader {
 	private void importLetters(Language language) {
 		ArrayList<Word> letters = new ArrayList<>();
 
+		boolean isEnglish = language.getLocale().equals(Locale.ENGLISH);
+
 		for (int key = 2; key <= 9; key++) {
 			for (String langChar : language.getKeyCharacters(key, false)) {
-				if (DictionaryDb.doesWordExistSync(language, langChar.toUpperCase(language.getLocale()))) {
-					continue;
-				}
+				langChar = (isEnglish && langChar.equals("i")) ? langChar.toUpperCase(Locale.ENGLISH) : langChar;
 
 				Word word = new Word();
 				word.langId = language.getId();