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b=a.base||"x",c=a.power||"y",this.button({value:"exponent",label:""+b+"<sup>"+c+"</sup>","class":"jc--button jc--button-other jc--button-exponent jc--button-exponent-"+b+"to"+c,ariaLabel:"Square"},a)},a.prototype.root=function(a){var b,c;return b=a.degree?""+a.degree:"",c=a.radicand||"x",this.button({value:"root",label:b?"<sup>"+b+"</sup>&#x221a;"+c:"&#x221a;"+c,"class":"jc--button jc--button-other jc--button-root jc--button-root-"+b+"of"+c,ariaLabel:"Square root"},a)},a.prototype.variables=function(a){var b,c;return c=function(){var c,d,e,f,g=this;for(e=a.variables,f=[],c=0,d=e.length;d>c;c++)b=e[c],f.push(function(b){return g.button({value:""+b.name,"class":"jc--button jc--button-variable",variable:b},a)}(b));return f}.call(this)},a.prototype.del=function(a){return this.button({value:"del",label:"Delete","class":"jc--button jc--button-del"},a)},a.prototype.clear=function(a){return this.button({value:"clear",label:"Clear","class":"jc--button 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