user
Instruction
Answer the question based on the provided table.


Table
Table Title: Portable character set
Table Content:
| name | glyph | C string | Unicode | Unicode name |
| --- | --- | --- | --- | --- |
| NUL |  | \\0 | U+0000 | NULL (NUL) |
| alert |  | \\a | U+0007 | BELL (BEL) |
| backspace |  | \\b | U+0008 | BACKSPACE (BS) |
| tab |  | \\t | U+0009 | CHARACTER TABULATION (HT) |
| carriage-return |  | \\r | U+000D | CARRIAGE RETURN (CR) |
| newline |  | \\n | U+000A | LINE FEED (LF) |
| vertical-tab |  | \\v | U+000B | LINE TABULATION (VT) |
| form-feed |  | \\f | U+000C | FORM FEED (FF) |
| space |  |  | U+0020 | SPACE |
| exclamation-mark | ! | ! | U+0021 | EXCLAMATION MARK |
| quotation-mark | " | \\" | U+0022 | QUOTATION MARK |
| number-sign | # | # | U+0023 | NUMBER SIGN |
| dollar-sign | $ | $ | U+0024 | DOLLAR SIGN |
| percent-sign | % | % | U+0025 | PERCENT SIGN |
| ampersand | & | & | U+0026 | AMPERSAND |
| apostrophe | ' | \\' | U+0027 | APOSTROPHE |
| left-parenthesis | ( | ( | U+0028 | LEFT PARENTHESIS |
| right-parenthesis | ) | ) | U+0029 | RIGHT PARENTHESIS |
| asterisk | * | * | U+002A | ASTERISK |
| plus-sign | + | + | U+002B | PLUS SIGN |
| comma | , | , | U+002C | COMMA |
| hyphen | - | - | U+002D | HYPHEN-MINUS |
| period | . | . | U+002E | FULL STOP |
| slash | / | / | U+002F | SOLIDUS |
| zero | 0 | 0 | U+0030 | DIGIT ZERO |
| one | 1 | 1 | U+0031 | DIGIT ONE |
| two | 2 | 2 | U+0032 | DIGIT TWO |
| three | 3 | 3 | U+0033 | DIGIT THREE |
| four | 4 | 4 | U+0034 | DIGIT FOUR |
| five | 5 | 5 | U+0035 | DIGIT FIVE |
| six | 6 | 6 | U+0036 | DIGIT SIX |
| seven | 7 | 7 | U+0037 | DIGIT SEVEN |
| eight | 8 | 8 | U+0038 | DIGIT EIGHT |
| nine | 9 | 9 | U+0039 | DIGIT NINE |
| colon | : | : | U+003A | COLON |
| semicolon | ; | ; | U+003B | SEMICOLON |
| less-than-sign | < | < | U+003C | LESS-THAN SIGN |
| equals-sign | = | = | U+003D | EQUALS SIGN |
| greater-than-sign | > | > | U+003E | GREATER-THAN SIGN |
| question-mark | ? | ? | U+003F | QUESTION MARK |
| commercial-at | @ | @ | U+0040 | COMMERCIAL AT |
| A | A | A | U+0041 | LATIN CAPITAL LETTER A |
| B | B | B | U+0042 | LATIN CAPITAL LETTER B |
| C | C | C | U+0043 | LATIN CAPITAL LETTER C |
| D | D | D | U+0044 | LATIN CAPITAL LETTER D |
| E | E | E | U+0045 | LATIN CAPITAL LETTER E |
| F | F | F | U+0046 | LATIN CAPITAL LETTER F |
| G | G | G | U+0047 | LATIN CAPITAL LETTER G |
| H | H | H | U+0048 | LATIN CAPITAL LETTER H |
| I | I | I | U+0049 | LATIN CAPITAL LETTER I |
| J | J | J | U+004A | LATIN CAPITAL LETTER J |
| K | K | K | U+004B | LATIN CAPITAL LETTER K |
| L | L | L | U+004C | LATIN CAPITAL LETTER L |
| M | M | M | U+004D | LATIN CAPITAL LETTER M |
| N | N | N | U+004E | LATIN CAPITAL LETTER N |
| O | O | O | U+004F | LATIN CAPITAL LETTER O |
| P | P | P | U+0050 | LATIN CAPITAL LETTER P |
| Q | Q | Q | U+0051 | LATIN CAPITAL LETTER Q |
| R | R | R | U+0052 | LATIN CAPITAL LETTER R |
| S | S | S | U+0053 | LATIN CAPITAL LETTER S |
| T | T | T | U+0054 | LATIN CAPITAL LETTER T |
| U | U | U | U+0055 | LATIN CAPITAL LETTER U |
| V | V | V | U+0056 | LATIN CAPITAL LETTER V |
| W | W | W | U+0057 | LATIN CAPITAL LETTER W |
| X | X | X | U+0058 | LATIN CAPITAL LETTER X |
| Y | Y | Y | U+0059 | LATIN CAPITAL LETTER Y |
| Z | Z | Z | U+005A | LATIN CAPITAL LETTER Z |
| left-square-bracket | [ | [ | U+005B | LEFT SQUARE BRACKET |
| backslash | \\ | \\\\ | U+005C | REVERSE SOLIDUS |
| right-square-bracket | ] | ] | U+005D | RIGHT SQUARE BRACKET |
| circumflex | ^ | ^ | U+005E | CIRCUMFLEX ACCENT |
| underscore | _ | _ | U+005F | LOW LINE |
| grave-accent | ` | ` | U+0060 | GRAVE ACCENT |
| a | a | a | U+0061 | LATIN SMALL LETTER A |
| b | b | b | U+0062 | LATIN SMALL LETTER B |
| c | c | c | U+0063 | LATIN SMALL LETTER C |
| d | d | d | U+0064 | LATIN SMALL LETTER D |
| e | e | e | U+0065 | LATIN SMALL LETTER E |
| f | f | f | U+0066 | LATIN SMALL LETTER F |
| g | g | g | U+0067 | LATIN SMALL LETTER G |
| h | h | h | U+0068 | LATIN SMALL LETTER H |
| i | i | i | U+0069 | LATIN SMALL LETTER I |
| j | j | j | U+006A | LATIN SMALL LETTER J |
| k | k | k | U+006B | LATIN SMALL LETTER K |
| l | l | l | U+006C | LATIN SMALL LETTER L |
| m | m | m | U+006D | LATIN SMALL LETTER M |
| n | n | n | U+006E | LATIN SMALL LETTER N |
| o | o | o | U+006F | LATIN SMALL LETTER O |
| p | p | p | U+0070 | LATIN SMALL LETTER P |
| q | q | q | U+0071 | LATIN SMALL LETTER Q |
| r | r | r | U+0072 | LATIN SMALL LETTER R |
| s | s | s | U+0073 | LATIN SMALL LETTER S |
| t | t | t | U+0074 | LATIN SMALL LETTER T |
| u | u | u | U+0075 | LATIN SMALL LETTER U |
| v | v | v | U+0076 | LATIN SMALL LETTER V |
| w | w | w | U+0077 | LATIN SMALL LETTER W |
| x | x | x | U+0078 | LATIN SMALL LETTER X |
| y | y | y | U+0079 | LATIN SMALL LETTER Y |
| z | z | z | U+007A | LATIN SMALL LETTER Z |
| left-brace | { | { | U+007B | LEFT CURLY BRACKET |
| vertical-line | \p | \p | U+007C | VERTICAL LINE |
| right-brace | } | } | U+007D | RIGHT CURLY BRACKET |
| tilde | ~ | ~ | U+007E | TILDE |


Question
what is the only character with a blank c string?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["space"]