ooo this looks tricky….. 

91GPGRB8C4G7JVVN41KPYX10EHM6JWS0C5SJ0XV5DHP2282QCNP6R833DHJP2WKCF4G4J83ECNJP883MDWG78T39DSNJ0VV641GJ0T31E9J6AWH0CDM62V3CCNQ6ES9E419PAS90D5K20YBFEMG66RBE41KPAX10EHM6JWS0DXQ6A81V54G6GX3ME1SKMBSFCDWP4SBJEDHPGVVFDGQ62RSFCDM62V3CCNQ6ES9G6CPK8DSN70WPARBKEHJQ4SB7CXM7AVKM

Douglas Crockford would be proud of this challenge…..