UNIX Command question

What would be the result (the number of the output lines) of the following grep command with the data txt as shown below grep '10-91113\ [8] data. txt where the content of data.txt is: 48 De 3BC1997 CPPX 68.00 LVX2A 138 483 Sept 5AP1996 USP 65.00 LVX2c 189 47 Oat 32L1998 CPPX 43.00 KVM9D 512 219 dea2CC1999 CAD 23.00 PLV2C 68 484 nov 7PL1996 CAD 49.00 PLv2c 234 483 may 5PA1998 USP 37.00 KVM9D 644 216 sept 32L1998 USP 86.00 KVM9E 234 5