problem@@1	problem	issue	29
problem@@1	problem	difficulty	23
problem@@1	problem	trouble	17
problem@@1	problem	dilemma	13
problem@@1	problem	obstacle	13
problem@@1	problem	complication	6
problem@@1	problem	challenge	5
problem@@1	problem	setback	3
problem@@1	problem	situation	3
problem@@1	problem	condition	2
problem@@1	problem	glitch	2
problem@@1	problem	mess	2