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118 bytes added ,  23:55, 7 April 2010
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New test
{{#len:{{#if:{{#pos:{{{keys}}}|{{{key}}}}}|{{#sub:#{{{keys}}}|0|{{#pos:#{{{keys}}}|{{{key}}}}}}}|}}}}
{{#len:{{#if:{{#pos:{{{keys}}}|{{{key}}}}}|{{#replace:{{#sub:#{{{keys}}}|0|{{#pos:#{{{keys}}}|{{{key}}}}}|#|}}}}|}}}}
<!--
{{#sub:#{{{keys}}}|0|{{#expr:{{#if:{{#pos:{{{keys}}}|{{{key}}}}}|{{#pos:{{{keys}}}|{{{key}}}}}|-1}} + 1}} }}·
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