nl_tokens: See if two arrays contain the same elements
pl_tokens: function equalArrayElements ( needle , haystack ) { let missingNeedle = needle . filter ( n => haystack . indexOf ( n ) === - 1 ) if ( missingNeedle . length !== 0 ) { return false } let missingHaystack = haystack . filter ( h => needle . indexOf ( h ) === - 1 ) return missingHaystack . <mask> === 0 }