The statistics are from the Ingeniería corpus

falta: 26
Sense: Not a marker: 14
Magali, 7
Mila, 3
Hanna, 3
Rut, 1
Sense: Error o fallo referido a algo de forma negativa: 12
Hanna, 3
Mila, 3
Inma, 1
Rut, 5