model model-sample-1

jpl = Student('JPL')
jpl trains in shorinkan  # Add 'shorinkan' to jpl's systems
jpl has rank shodan  # assume's 'shorinkan' because it's the only one

asm = Student('ASM')
asm has rank green in shorinkan  # more precise
promote asm
asm trains in kobudo  # Not defined in model
