Semiconductor devices

A semiconductor device, comprising:

• first and second select lines extending in a first direction on a substrate and spaced apart from each other in a second direction crossing the first direction, with a first separating insulation layer therebetween;
• a plurality of first and second vertical pillars, each of the plurality of first and second vertical pillars connected to a corresponding one of the first and second select lines, the first vertical pillars closer to the first separating insulation layer than the second vertical pillars arranged in an oblique direction from the first vertical pillars;
• first subsidiary lines, each of the first subsidiary lines electrically connecting a pair of the first vertical pillars adjacent to each other in the second direction;
• and
• second subsidiary lines, each of the second subsidiary lines electrically connecting a pair of the second vertical pillars adjacent to each other in the second direction, wherein
• the first and second subsidiary lines are alternately disposed along the first direction, and wherein:
• ends of the first subsidiary lines and ends of the second subsidiary lines are aligned to each other along the first direction.