A paper coating slip contains a polymer dispersed with polyvinyl alcohol as protective colloid in water. The sublimation pen comprises a pen main body, an ink inlet provided on the pen main body, and a variable-width ink passageway defined within the pen main body and capable of fluidly communicating with the ink inlet. Fluid flow is controlled by canceling out at least a portion of a discharge stroke of one plunger with a suction stroke of another plunger. The tab end and the rear pad region define a thumb abutting area for application of forces to prevent undesirable rotation of the flute about the flute axis and to prevent undesirable downward displacement and deviation of the flute during playing. If the query is nondestructive, the query is executed against a data subset of the complete data repository.