Add plain-021 to plain-025 problems

problems/plain/021-delete-till-char.json

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+{
+  "id": "plain-021",
+  "category": "plain",
+  "difficulty": 2,
+  "start": [
+    "Hello there, world"
+  ],
+  "goal": [
+    ", world"
+  ],
+  "solutions": [
+    {
+      "keys": "dt,",
+      "optimal": true
+    },
+    {
+      "keys": "vt,d"
+    }
+  ],
+  "tags": [
+    "dt",
+    "t",
+    "delete"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "指定した文字の手前まで削除する",
+      "description": "カンマの手前までを削除して , world にしてください",
+      "hints": [
+        "t は「その文字の手前まで」移動する。オペレータと組み合わせられる"
+      ],
+      "notes": [
+        "dt, で行頭からカンマの手前までを削除する。カンマ自体は残る",
+        "vt, でカンマの手前まで選択してから d。同じ範囲をビジュアルモードで消す"
+      ]
+    },
+    "en": {
+      "title": "Delete up to a character",
+      "description": "Delete everything before the comma to get ', world'",
+      "hints": [
+        "t moves to just before a character, and it works as a motion for operators"
+      ],
+      "notes": [
+        "dt, deletes from the cursor up to (but not including) the comma",
+        "vt, selects up to just before the comma, then d deletes the selection"
+      ]
+    }
+  }
+}

problems/plain/022-change-in-quotes.json

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+{
+  "id": "plain-022",
+  "category": "plain",
+  "difficulty": 3,
+  "start": [
+    "She said \"hello\" quietly"
+  ],
+  "goal": [
+    "She said \"goodbye\" quietly"
+  ],
+  "solutions": [
+    {
+      "keys": "ci\"goodbye<Esc>",
+      "optimal": true
+    },
+    {
+      "keys": "f\"lct\"goodbye<Esc>"
+    }
+  ],
+  "tags": [
+    "ci\"",
+    "text-object",
+    "change"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "引用符の中身を変更する",
+      "description": "hello を goodbye に変えて She said \"goodbye\" quietly にしてください",
+      "hints": [
+        "i\" は「引用符の内側」のテキストオブジェクト。行内なら引用符まで移動しなくても効く"
+      ],
+      "notes": [
+        "ci\" は引用符の内側だけを変更する。カーソルが引用符より手前にあっても行内なら対象を見つけてくれる",
+        "f\" で開き引用符へ、l で中へ入り、ct\" で閉じ引用符の手前まで変更する"
+      ]
+    },
+    "en": {
+      "title": "Change text inside quotes",
+      "description": "Change 'hello' to 'goodbye' to get She said \"goodbye\" quietly",
+      "hints": [
+        "i\" is the 'inside quotes' text object; it finds the quoted text on the line for you"
+      ],
+      "notes": [
+        "ci\" changes just the text inside the quotes, even from earlier on the line",
+        "f\" jumps to the opening quote, l steps inside, and ct\" changes up to the closing quote"
+      ]
+    }
+  }
+}

problems/plain/023-delete-to-end-of-file.json

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+{
+  "id": "plain-023",
+  "category": "plain",
+  "difficulty": 2,
+  "start": [
+    "keep this line",
+    "drop this line",
+    "drop this too",
+    "and drop this"
+  ],
+  "goal": [
+    "keep this line"
+  ],
+  "solutions": [
+    {
+      "keys": "jdG",
+      "optimal": true
+    },
+    {
+      "keys": "j3dd"
+    }
+  ],
+  "tags": [
+    "dG",
+    "G",
+    "delete"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "ファイル末尾まで削除する",
+      "description": "2 行目以降を削除して keep this line だけにしてください",
+      "hints": [
+        "G はファイル末尾へ移動する。オペレータと組み合わせると末尾までまとめて消せる"
+      ],
+      "notes": [
+        "j で 2 行目へ移動し dG。カーソル行から最終行までを行単位で削除する",
+        "j で 2 行目へ移動し 3dd。消す行数を数えて指定するやり方"
+      ]
+    },
+    "en": {
+      "title": "Delete to the end of the file",
+      "description": "Delete everything from line 2 down so only 'keep this line' remains",
+      "hints": [
+        "G moves to the last line; combined with an operator it reaches the end of the file"
+      ],
+      "notes": [
+        "j moves to line 2, then dG deletes linewise from there to the last line",
+        "j moves to line 2, then 3dd deletes the three lines by count"
+      ]
+    }
+  }
+}

problems/plain/024-search-then-change.json

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+{
+  "id": "plain-024",
+  "category": "plain",
+  "difficulty": 2,
+  "start": [
+    "one two three",
+    "four five six",
+    "seven target nine"
+  ],
+  "goal": [
+    "one two three",
+    "four five six",
+    "seven found nine"
+  ],
+  "solutions": [
+    {
+      "keys": "/target<CR>cwfound<Esc>",
+      "optimal": true
+    },
+    {
+      "keys": "2jwcwfound<Esc>"
+    }
+  ],
+  "tags": [
+    "search",
+    "/",
+    "cw",
+    "change"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "検索して移動してから書き換える",
+      "description": "target を found に変えて seven found nine にしてください",
+      "hints": [
+        "/ で検索するとカーソルがヒット位置へ飛ぶ。移動手段として使える"
+      ],
+      "notes": [
+        "/target<CR> で単語の先頭へ飛び、cw で書き換える。行数を数えなくてよい",
+        "2j で 3 行目へ、w で target の先頭へ移動してから cw。検索を使わないやり方"
+      ]
+    },
+    "en": {
+      "title": "Search, then change",
+      "description": "Change 'target' to 'found' to get 'seven found nine'",
+      "hints": [
+        "/ searches and moves the cursor to the match, so it doubles as a motion"
+      ],
+      "notes": [
+        "/target<CR> jumps straight to the word, then cw changes it — no line counting",
+        "2j goes to line 3 and w moves onto 'target', then cw changes it"
+      ]
+    }
+  }
+}

problems/plain/025-visual-replace-word.json

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+{
+  "id": "plain-025",
+  "category": "plain",
+  "difficulty": 3,
+  "start": [
+    "apple banana",
+    "cherry banana"
+  ],
+  "goal": [
+    "apple banana",
+    "cherry apple"
+  ],
+  "solutions": [
+    {
+      "keys": "yiwjwviwp",
+      "optimal": true
+    },
+    {
+      "keys": "yiwjwcw<C-r>0<Esc>"
+    }
+  ],
+  "tags": [
+    "yiw",
+    "viwp",
+    "visual",
+    "yank",
+    "put"
+  ],
+  "i18n": {
+    "ja": {
+      "title": "ヤンクした単語で別の単語を置き換える",
+      "description": "2 行目の banana を apple に変えて cherry apple にしてください",
+      "hints": [
+        "ビジュアル選択中に p を押すと、選択範囲がレジスタの中身で置き換わる"
+      ],
+      "notes": [
+        "yiw で apple をヤンクし、jw で 2 行目の banana へ。viw で選択して p で置き換える",
+        "yiw でヤンクし、cw の挿入中に <C-r>0 でヤンクレジスタを貼り付ける"
+      ]
+    },
+    "en": {
+      "title": "Replace a word with a yanked word",
+      "description": "Change 'banana' on line 2 to 'apple' to get 'cherry apple'",
+      "hints": [
+        "Pressing p over a visual selection replaces the selection with the register"
+      ],
+      "notes": [
+        "yiw yanks 'apple', jw moves to 'banana' on line 2, viw selects it and p replaces it",
+        "yiw yanks the word, then cw with <C-r>0 inserts the yank register instead of typing"
+      ]
+    }
+  }
+}