Add data-017 to data-021 problems

problems/data/017-prefix-column.json

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+{
+  "id": "data-017",
+  "category": "data",
+  "difficulty": 3,
+  "start": [
+    "alice,30",
+    "bob,25",
+    "carol,41"
+  ],
+  "goal": [
+    "#alice,30",
+    "#bob,25",
+    "#carol,41"
+  ],
+  "solutions": [
+    {
+      "keys": "<C-v>jjI#<Esc>",
+      "optimal": true
+    },
+    {
+      "keys": ":%s/^/#/<CR>"
+    }
+  ],
+  "tags": [
+    "<C-v>",
+    "visual-block",
+    "insert",
+    "csv"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "全行の先頭に # を付ける",
+      "description": "3 行すべての行頭に # を挿入してください",
+      "hints": [
+        "矩形選択したまま挿入すると、選択した全行に同じ文字が入る"
+      ],
+      "notes": [
+        "<C-v>jj で 3 行分の矩形を選び、I で先頭に挿入して <Esc> で全行に反映する",
+        ":%s/^/#/ は各行の行頭にマッチさせて # を挿入する"
+      ]
+    },
+    "en": {
+      "title": "Prefix every line with #",
+      "description": "Insert a # at the beginning of all three lines",
+      "hints": [
+        "Inserting from a blockwise selection applies the same text to every selected line"
+      ],
+      "notes": [
+        "<C-v>jj selects a block spanning three lines, I inserts at the start, and <Esc> applies it to every line",
+        ":%s/^/#/ matches the start of each line and inserts a #"
+      ]
+    }
+  }
+}

problems/data/018-sort-records.json

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+{
+  "id": "data-018",
+  "category": "data",
+  "difficulty": 2,
+  "start": [
+    "banana,3",
+    "apple,5",
+    "cherry,2"
+  ],
+  "goal": [
+    "apple,5",
+    "banana,3",
+    "cherry,2"
+  ],
+  "solutions": [
+    {
+      "keys": ":sort<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":1,3sort<CR>"
+    }
+  ],
+  "tags": [
+    ":sort",
+    "sort",
+    "csv"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "レコードを名前順に並べ替える",
+      "description": "3 行を先頭の名前の昇順に並べ替えてください",
+      "hints": [
+        "並べ替え専用の Ex コマンドがある"
+      ],
+      "notes": [
+        ":sort は範囲を省略するとバッファ全体を辞書順に並べ替える",
+        ":1,3sort は 1〜3 行目を明示して並べ替える。範囲指定が必要なときの書き方"
+      ]
+    },
+    "en": {
+      "title": "Sort the records by name",
+      "description": "Reorder the three lines alphabetically by the leading name",
+      "hints": [
+        "There is an Ex command dedicated to sorting"
+      ],
+      "notes": [
+        ":sort with no range sorts the whole buffer lexicographically",
+        ":1,3sort sorts lines 1 through 3 explicitly, the form to use when you need a range"
+      ]
+    }
+  }
+}

problems/data/019-swap-columns.json

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+{
+  "id": "data-019",
+  "category": "data",
+  "difficulty": 3,
+  "start": [
+    "alice,30",
+    "bob,25",
+    "carol,41"
+  ],
+  "goal": [
+    "30,alice",
+    "25,bob",
+    "41,carol"
+  ],
+  "solutions": [
+    {
+      "keys": ":%s/\\(.*\\),\\(.*\\)/\\2,\\1/<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":%s/\\v(\\w+),(\\w+)/\\2,\\1/<CR>"
+    }
+  ],
+  "tags": [
+    ":s",
+    "substitute",
+    "regex",
+    "csv"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "2 つの列を入れ替える",
+      "description": "各行の名前と数値の並びを入れ替えて「数値,名前」にしてください",
+      "hints": [
+        "置換でカンマの前後をそれぞれ取り込んでおくと、置換後に順番を入れ替えられる"
+      ],
+      "notes": [
+        "\\(...\\) で囲んだ 2 か所を \\1 \\2 で参照し、順番を逆にして書き戻す",
+        "\\v を付けると括弧のエスケープが不要になる。\\w+ で各列を取り込んで入れ替える"
+      ]
+    },
+    "en": {
+      "title": "Swap the two columns",
+      "description": "Reverse the name and number on each line so it reads number,name",
+      "hints": [
+        "Capture what is on each side of the comma, then write the captures back in the other order"
+      ],
+      "notes": [
+        "The two \\(...\\) groups are referenced as \\1 and \\2 and written back reversed",
+        "With \\v the parentheses need no escaping; \\w+ captures each column before swapping them"
+      ]
+    }
+  }
+}

problems/data/020-increment-count.json

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+{
+  "id": "data-020",
+  "category": "data",
+  "difficulty": 2,
+  "start": [
+    "ERROR retry count=9"
+  ],
+  "goal": [
+    "ERROR retry count=10"
+  ],
+  "solutions": [
+    {
+      "keys": "<C-a>",
+      "optimal": true
+    },
+    {
+      "keys": "$<C-a>"
+    }
+  ],
+  "tags": [
+    "<C-a>",
+    "increment",
+    "log"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "カウントを 1 増やす",
+      "description": "行末のカウントを 9 から 10 に増やしてください",
+      "hints": [
+        "数字を書き換えなくても、その場で増やせるコマンドがある"
+      ],
+      "notes": [
+        "<C-a> はカーソル位置以降で最初に見つかった数値を 1 増やす。行頭からでもそのまま効く",
+        "$ で数値の上に移動してから <C-a> で増やす。狙う数値が複数あるときはこの形が確実"
+      ]
+    },
+    "en": {
+      "title": "Increment the count",
+      "description": "Raise the count at the end of the line from 9 to 10",
+      "hints": [
+        "You can bump a number in place instead of retyping it"
+      ],
+      "notes": [
+        "<C-a> increments the first number at or after the cursor, so it works straight from the start of the line",
+        "$ moves onto the number first, then <C-a> increments it — the reliable form when a line holds several numbers"
+      ]
+    }
+  }
+}

problems/data/021-append-comma.json

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+{
+  "id": "data-021",
+  "category": "data",
+  "difficulty": 2,
+  "start": [
+    "alice",
+    "bob",
+    "carol"
+  ],
+  "goal": [
+    "alice,",
+    "bob,",
+    "carol,"
+  ],
+  "solutions": [
+    {
+      "keys": ":%s/$/,/<CR>",
+      "optimal": true
+    },
+    {
+      "keys": ":%normal! A,<CR>"
+    }
+  ],
+  "tags": [
+    ":s",
+    ":normal",
+    "substitute",
+    "csv"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "全行の末尾にカンマを付ける",
+      "description": "3 行すべての行末にカンマを追加してください",
+      "hints": [
+        "行末そのものにマッチさせれば、1 回の置換で全行に追記できる"
+      ],
+      "notes": [
+        ":%s/$/,/ は各行の行末にマッチして、そこにカンマを挿入する",
+        ":%normal! A, は各行で追記モードに入りカンマを打つ。<CR> でコマンドを終えると挿入も確定する"
+      ]
+    },
+    "en": {
+      "title": "Append a comma to every line",
+      "description": "Add a trailing comma to all three lines",
+      "hints": [
+        "Matching the end of the line lets a single substitution append to every line"
+      ],
+      "notes": [
+        ":%s/$/,/ matches the end of each line and inserts a comma there",
+        ":%normal! A, appends a comma on each line; ending the command with <CR> also ends the insert"
+      ]
+    }
+  }
+}