To further analyze the CRABS CLAW gene (see Problems 19 and 20), you create a map of the genomic clone. The 11-kb EcoRI fragment is ligated into the EcoRI site of the MCS of the vector shown in Problem 18. You digest the double-stranded form of the genome with several restriction enzymes and obtain the following results. Draw, as far as possible, a map of the genomic clone of CRABS CLAW.

EcoRI                   11.0, 3.0                     XbaI     4.5, 9.5
EcoRI + XbaI        4.5, 6.5, 3.0               XhoI     13.2, 0.8
EcoRI + XhoI        10.2, 3.0, 0.8             SalI       6.0, 8.0
EcoRI + SalI          6.0, 5.0, 3.0              HindIII   12.0, 1.5, 0.5
EcoRI + HindIII      9.0, 3.0, 1.5, 0.5

What restriction digest would help resolve any ambiguity in the map?