"escalonados por grado de dificultad" in English

staggered- graduated- stepped- tiered- layered

rolling

by- for- because of- through- via- for the sake of- per- of- out of- over- to- from- times- afterafter

a- the

degree- grade- pitch- quotient- BAS- BAS- rank- stage- form- year

name of the letter D

from- of- as- out of- in- off- on- than- to- by

than

de-

difficulty- impediment- elusiveness- facer- hardness- hiccough- hiccup- pitfall- trickiness

to hinder- to arrest- to constrict- to hamper- to impede- to impede- to hinder- to make something difficult- to obstruct- to make … difficult

to allot- to hand over- to accord- to accord- to advance- to allow- to assign- to award- to bear- to blow- to bring forth- to deal- to dish out- to dispense- to dispense- to dole out- to earn- to get in- to give out- to give out- to hand out- to hold- to hold out- to impart- to issue- to lay on- to pass on- to pitch- to play- to produce- to produce- to proffer- to put on- to quote- to render- to send forth- to show- to sing out- to stage- to strike- to strike- to throw- to throw out- to throw up- to toss- to utter- to yield- to deal- to perform- to pitch- to strike- to quote- to return- to give- to provide- to deliver- to administer- to ruin- to spoil- to face- to flow into- to go into- to lead to- to give on to- to hit