diff --git a/transpose.json b/transpose.json
new file mode 100644
index 0000000000..123f7c2ae0
--- /dev/null
+++ b/transpose.json
@@ -0,0 +1,231 @@
+{
+  "#": [
+      "JSON doesn't allow for multi-line strings, so all multi-line input is ",
+      "presented here as arrays of strings. It's up to the test generator to join the ", 
+      "lines together with line breaks."
+  ],
+  "cases": [
+    {
+      "description": "empty string",
+      "input": "",
+      "expected": ""
+    },
+    {
+      "description": "two characters",
+      "input": "A1",
+      "expected": [ 
+          "A",
+          "1"
+        ]
+    },
+    {
+      "description": "simple",
+      "input": [ 
+          "ABC",
+          "123"
+        ],
+      "expected": [ 
+          "A1",
+          "B2",
+          "C3"
+        ]
+    },
+    {
+      "description": "single line",
+      "input": "Single line.",
+      "expected": [ 
+          "S",
+          "i",
+          "n",
+          "g",
+          "l",
+          "e",
+          " ",
+          "l",
+          "i",
+          "n",
+          "e",
+          "."
+        ]
+    },
+    {
+      "description": "first line longer than second line",
+      "input": [ 
+          "The fourth line.",
+          "The fifth line."
+        ],
+      "expected": [ 
+          "TT",
+          "hh",
+          "ee",
+          "  ",
+          "ff",
+          "oi",
+          "uf",
+          "rt",
+          "th",
+          "h ",
+          " l",
+          "li",
+          "in",
+          "ne",
+          "e.",
+          "."    
+        ]
+    },
+    {
+      "description": "second line longer than first line",
+      "input": [ 
+          "The first line.",
+          "The second line."
+        ],
+      "expected": [ 
+          "TT",
+          "hh",
+          "ee",
+          "  ",
+          "fs",
+          "ie",
+          "rc",
+          "so",
+          "tn",
+          " d",
+          "l ",
+          "il",
+          "ni",
+          "en",
+          ".e",
+          " ." 
+        ]
+    },
+    {
+      "description": "square",
+      "input": [ 
+          "HEART",
+          "EMBER",
+          "ABUSE",
+          "RESIN",
+          "TREND"
+        ],
+      "expected": [
+          "HEART",
+          "EMBER",
+          "ABUSE",
+          "RESIN",
+          "TREND" 
+        ]
+    },
+    {
+      "description": "rectangle",
+      "input": [ 
+          "FRACTURE",
+          "OUTLINED",
+          "BLOOMING",
+          "SEPTETTE"
+        ],
+      "expected": [ 
+          "FOBS", 
+          "RULE", 
+          "ATOP", 
+          "CLOT", 
+          "TIME", 
+          "UNIT", 
+          "RENT", 
+          "EDGE" 
+        ]
+    },
+    {
+      "description": "triangle",
+      "input": [ 
+          "T",
+          "EE",
+          "AAA",
+          "SSSS",
+          "EEEEE",
+          "RRRRRR"
+        ],
+      "expected": [ 
+          "TEASER",
+          " EASER",
+          "  ASER",
+          "   SER",
+          "    ER",
+          "     R"
+        ]
+    },
+    {
+      "description": "many lines",
+      "input": [ 
+          "Chor. Two households, both alike in dignity,",
+          "In fair Verona, where we lay our scene,",
+          "From ancient grudge break to new mutiny,",
+          "Where civil blood makes civil hands unclean.",
+          "From forth the fatal loins of these two foes",
+          "A pair of star-cross'd lovers take their life;",
+          "Whose misadventur'd piteous overthrows",
+          "Doth with their death bury their parents' strife.",
+          "The fearful passage of their death-mark'd love,",
+          "And the continuance of their parents' rage,",
+          "Which, but their children's end, naught could remove,",
+          "Is now the two hours' traffic of our stage;",
+          "The which if you with patient ears attend,",
+          "What here shall miss, our toil shall strive to mend."
+        ],
+      "expected": [ 
+          "CIFWFAWDTAWITW",
+          "hnrhr hohnhshh",
+          "o oeopotedi ea",
+          "rfmrmash  cn t",
+          ".a e ie fthow ",
+          " ia fr weh,whh",
+          "Trnco miae  ie",
+          "w ciroitr btcr",
+          "oVivtfshfcuhhe",
+          " eeih a uote  ",
+          "hrnl sdtln  is",
+          "oot ttvh tttfh",
+          "un bhaeepihw a",
+          "saglernianeoyl",
+          "e,ro -trsui ol",
+          "h uofcu sarhu ",
+          "owddarrdan o m",
+          "lhg to'egccuwi",
+          "deemasdaeehris",
+          "sr als t  ists",
+          ",ebk 'phool'h,",
+          "  reldi ffd   ",
+          "bweso tb  rtpo",
+          "oea ileutterau",
+          "t kcnoorhhnatr",
+          "hl isvuyee'fi ",
+          " atv es iisfet",
+          "ayoior trr ino",
+          "l  lfsoh  ecti",
+          "ion   vedpn  l",
+          "kuehtteieadoe ",
+          "erwaharrar,fas",
+          "   nekt te  rh",
+          "ismdsehphnnosa",
+          "ncuse ra-tau l",
+          " et  tormsural",
+          "dniuthwea'g t ",
+          "iennwesnr hsts",
+          "g,ycoi tkrttet",
+          "n ,l r s'a anr",
+          "i  ef  'dgcgdi",
+          "t  aol   eoe,v",
+          "y  nei sl,u; e",
+          ",  .sf to l   ",
+          "     e rv d  t",
+          "     ; ie    o",
+          "       f, r   ",
+          "       e  e  m",
+          "       .  m  e",
+          "          o  n",
+          "          v  d",
+          "          e  .",
+          "          ,  "
+      ]
+    }
+  ]
+}
diff --git a/transpose.md b/transpose.md
index d7760ccf64..fb95771aa8 100644
--- a/transpose.md
+++ b/transpose.md
@@ -16,3 +16,42 @@ CF
 ```
 
 Rows become columns and columns become rows. See <https://en.wikipedia.org/wiki/Transpose>.
+
+If the input has rows of different lengths, this is to be solved as follows:
+
+- Pad to the left with spaces.
+- Don't pad to the right.
+
+Therefore, transposing this matrix:
+
+```
+ABC
+DE
+```
+
+results in:
+
+```
+AD
+BE
+C
+```
+
+And transposing:
+
+```
+AB
+DEF
+```
+
+results in:
+
+```
+AD
+BE
+ F
+```
+
+In general, all characters from the input should also be present in the transposed output.
+That means that if a column in the input text contains only spaces on its bottom-most row(s), 
+the corresponding output row should contain the spaces in its right-most column(s).
\ No newline at end of file