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class='String'>'m'</tspan></text> + <text dy='0.32em' x='48' y='228.8'><tspan class='String'>'i'</tspan></text> + <text dy='0.32em' x='96' y='228.8'><tspan class='String'>'s'</tspan></text> + <text dy='0.32em' x='144' y='228.8'><tspan class='String'>'p'</tspan></text> + <g font-size='24px'> + <text dy='0.32em' x='-50.4' y='-1.1'><tspan class='Value'>𝕩</tspan></text> + <text dy='0.32em' x='-50.4' y='38.5'><tspan class='Function'>⊐</tspan></text> + <text dy='0.32em' x='-50.4' y='106.7'><tspan class='Function'>⊒</tspan></text> + <text dy='0.32em' x='-50.4' y='174.9'><tspan class='Function'>∊</tspan></text> + <text dy='0.32em' x='-50.4' y='227.7'><tspan class='Function'>⍷</tspan></text> + </g> + </g> +</svg> + <p>BQN has four self-comparison functions, Classify (<code><span class='Function'>⊐</span></code>), Occurrence Count (<code><span class='Function'>⊒</span></code>), Mark Firsts (<code><span class='Function'>∊</span></code>), and Deduplicate (<code><span class='Function'>⍷</span></code>). Each of these is a monadic function that obtains its result by comparing each major cell of the argument (which must have rank at least 1) to the earlier major cells with <a href="match.html">match</a>. For example, Mark Firsts indicates the cells that don't match any earlier cell, making them the first of their kind.</p> <a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oiKICJhYmFhY2Ii">↗️</a><pre> <span class='Function'>∊</span> <span class='String'>"abaacb"</span> ⟨ 1 1 0 0 1 0 ⟩ |