3002;<code>Maybe a</code>&#x306E;&#x578B;&#x5909;&#x6570;&#x306F;&#x5177;&#x4F53;&#x7684;&#x306A;&#x5024;&#x6B21;&#x7B2C;&#x3067;<code>Maybe Float</code>&#x3084;<code>Maybe String</code>&#x3068;&#x3044;&#x3063;&#x305F;&#x578B;&#x3092;&#x6301;&#x3064;&#x3053;&#x3068;&#x3092;&#x53EF;&#x80FD;&#x306B;&#x3057;&#x307E;&#x3059;&#x3002;</p>
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<p><code>Maybe</code>&#x306B;&#x306F;&#x4E3B;&#x306B;2&#x3064;&#x306E;&#x4F7F;&#x3044;&#