diff --git a/index.js b/index.js
index 592f0705..bf9f4d3a 100644
--- a/index.js
+++ b/index.js
@@ -14,7 +14,7 @@ function is(x) {
         1101, // Binary 13
         "XIII", // Roman numeral 13
         "0xD", // Hex 13
-        
+
         "https://scontent.cdninstagram.com/hphotos-xtf1/t51.2885-15/s320x320/e35/12237511_444845689040315_1101385461_n.jpg", // Just because we can
         "https://www.youtube.com/watch?v=pte3Jg-2Ax4", // Thirteen by Big Star
         "rem hadley", // And because he's 13
@@ -23,7 +23,7 @@ function is(x) {
         "Dr. Remy Beauregard Hadley", // Why not 13's real name?!
 
         // Imaginary 13's
-        "13+0i", 
+        "13+0i",
         "13 + 13i",
         "13i",
 
@@ -38,7 +38,7 @@ function is(x) {
         "trinaest", // Croatian
         "tretten", // Danish / Norwegian
         "kolmteist", // Estonian
-        "שלוש עשרה", // Hebrew 
+        "שלוש עשרה", // Hebrew
         "labintatlo", // Filipino
         "kolmetoista", // Finnish
         "treize", // French
@@ -73,13 +73,9 @@ function is(x) {
         "تیرہ", // Urdu
         "tri ar ddeg", // Welsh
         "דרייַצן", // Yiddish,
+        "דרייצן", // Yiddish (without diacritics),
         "kumi na tatu", // Swahili
-        
-        //Imaginary 13's
-        "13+0i",
-        "13 + 13i",
-        "13i",
-        
+
         // Thirteen pronunciation
         "θərˈtiːn"
     ]
@@ -109,6 +105,13 @@ function is(x) {
                 }
             }
         },
+        square: {
+            of: {
+                thirteen: function() {
+                    return x === 169;
+                }
+            }
+        },
         within: function(y) {
             return {
                 of: {
diff --git a/test.js b/test.js
index d89d3e48..bebfe8ef 100644
--- a/test.js
+++ b/test.js
@@ -1,5 +1,5 @@
 const tap = require('tap');
-const isThirteen = require('./');
+const is = require('./');
 
 
 tap.equal(is(13).thirteen(), true);
@@ -53,7 +53,7 @@ tap.equal(is("tiga belas").thirteen(), true); // Malay
 tap.equal(is("арван").thirteen(), true); // Mongolian
 tap.equal(is("trzynaście").thirteen(), true); // Polish
 tap.equal(is("treze").thirteen(), true); // Portoguese
-tap.equal(is("ਤੀਹ").thirteen(), true); // Punjabi 
+tap.equal(is("ਤੀਹ").thirteen(), true); // Punjabi
 tap.equal(is("treisprezece").thirteen(), true); // Romanian
 tap.equal(is("тринадцать").thirteen(), true); // Russia
 tap.equal(is("trinásť").thirteen(), true); // Slovak
@@ -66,4 +66,5 @@ tap.equal(is("тринадцять").thirteen(), true); // Ukrainian
 tap.equal(is("تیرہ").thirteen(), true); // Urdu
 tap.equal(is("tri ar ddeg").thirteen(), true); // Welsh
 tap.equal(is("דרייַצן").thirteen(), true); // Yiddish
+tap.equal(is("דרייצן").thirteen(), true); // Yiddish (without diacritics),
 tap.equal(is("kumi na tatu").thirteen(), true); // Swahili