Editing Template:PlanetMath attribution

<!-- First check to see if there are multiple articles, 
-->{{#if: {{{title2|}}}
| <!-- multiple
-->''This article incorporates material from the following [[PlanetMath]] articles, which are licensed under the [[WP:CC-BY-SA|Creative Commons Attribution/Share-Alike License]]: <!--
We list the first two articles explicitly, since we know they exist, then check for further articles. Note that these further checks are *not* nested – this makes the code much more readable, and, as a bonus, robust to skipped entries.

Start with the 1st article
--> {{#if: {{{urlname|}}} | [http://planetmath.org/{{{urlname}}} {{{title}}}] | {{#if: {{{id|}}} | <!--[[PlanetMath:{{{urlname}}}|-->{{{title}}}<!--]]--> | [{{{sourceurl}}} {{{title}}}] }} }}<!--
-->, <!-- 2nd article
--> {{#if: {{{urlname2|}}} | [http://planetmath.org/{{{urlname2}}} {{{title2}}}] | {{#if: {{{id2|}}} | <!--[[PlanetMath:{{{urlname2}}}|-->{{{title2}}}<!--]]--> | [{{{sourceurl2}}} {{{title2}}}] }} }}<!--
--><!-- 3rd article, if any
-->{{#if: {{{title3|}}} | , {{#if: {{{urlname3|}}} | [http://planetmath.org/{{{urlname3}}} {{{title3}}}] | {{#if: {{{id3|}}} | <!--[[PlanetMath:{{{urlname3}}}|-->{{{title3}}}<!--]]--> | [{{{sourceurl3}}} {{{title3}}}] }} }} }}<!-- 4th?
-->{{#if: {{{title4|}}} | , {{#if: {{{urlname4|}}} | [http://planetmath.org/{{{urlname4}}} {{{title4}}}] | {{#if: {{{id4|}}} | <!--[[PlanetMath:{{{urlname4}}}|-->{{{title4}}}<!--]]--> | [{{{sourceurl4}}} {{{title4}}}] }} }} }}<!-- 5th?
-->{{#if: {{{title5|}}} | , {{#if: {{{urlname5|}}} | [http://planetmath.org/{{{urlname5}}} {{{title5}}}] | {{#if: {{{id5|}}} | <!--[[PlanetMath:{{{urlname5}}}|-->{{{title5}}}<!--]]--> | [{{{sourceurl5}}} {{{title5}}}] }} }} }}<!-- 6th?
-->{{#if: {{{title6|}}} | , {{#if: {{{urlname6|}}} | [http://planetmath.org/{{{urlname6}}} {{{title6}}}] | {{#if: {{{id6|}}} | <!--[[PlanetMath:{{{urlname6}}}|-->{{{title6}}}<!--]]--> | [{{{sourceurl6}}} {{{title6}}}] }} }} }}<!-- 7th?
-->{{#if: {{{title7|}}} | , {{#if: {{{urlname7|}}} | [http://planetmath.org/{{{urlname7}}} {{{title7}}}] | {{#if: {{{id7|}}} | <!--[[PlanetMath:{{{urlname7}}}|-->{{{title7}}}<!--]]--> | [{{{sourceurl7}}} {{{title7}}}] }} }} }}<!-- 8th?
-->{{#if: {{{title8|}}} | , {{#if: {{{urlname8|}}} | [http://planetmath.org/{{{urlname8}}} {{{title8}}}] | {{#if: {{{id8|}}} | <!--[[PlanetMath:{{{urlname8}}}|-->{{{title8}}}<!--]]--> | [{{{sourceurl8}}} {{{title8}}}] }} }} }}<!-- 9th?
-->{{#if: {{{title9|}}} | , {{#if: {{{urlname9|}}} | [http://planetmath.org/{{{urlname9}}} {{{title9}}}] | {{#if: {{{id9|}}} | <!--[[PlanetMath:{{{urlname9}}}|-->{{{title9}}}<!--]]--> | [{{{sourceurl9}}} {{{title9}}}] }} }} }}<!--
-->.''<!-- End of list
--> | <!-- single article
-->''This article incorporates material from {{#if: {{{urlname|}}} | [http://planetmath.org/{{{urlname}}} {{{title}}}] | <!--[[PlanetMath:{{{urlname}}}|-->{{{title}}}<!--]]-->}} on [[PlanetMath]], which is licensed under the [[WP:CC-BY-SA|Creative Commons Attribution/Share-Alike License]].'' }}<includeonly>[[Category:Wikipedia articles incorporating text from PlanetMath|{{PAGENAME}}]]</includeonly><noinclude>{{Documentation}}
</noinclude>