const fs = require('fs');

let file = JSON.parse(fs.readFileSync('data.json'));
const oldLen = file.length;

file = file.filter((value, index, array) => {
  return (value.solution.length === 5 && value.solution !== 'ERROR')
})
console.log(`Filtered to ${file.length} items from ${oldLen} items`)

fs.writeFileSync('data-filtered.json', JSON.stringify(file))
console.log('done')