in prm800k/grading/grader.py [0:0]
def _inject_implicit_mixed_number(step: str):
"""
Automatically make a mixed number evalable
e.g. 7 3/4 => 7+3/4
"""
p1 = re.compile("([0-9]) +([0-9])")
step = p1.sub("\\1+\\2", step) ## implicit mults
return step