Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to protect cedar shingles [title] Regularly clear debris off of the shingles. [substeps] Organic matter like branches and leaves that lie on cedar for a long time can grow mold and mildew, which will in turn seep in the cedar and cause its quality to deteriorate. Clear the shingles approximately every 2 weeks, and remember to remove any debris after rainstorms.

Ending1: [title] Clear ice and snow off of the shingles. [title] Keep inside areas behind the shingles properly insulated. Ending2: [title] Sweep up and remove the pine shingles every three weeks. [substeps] Pine shingles are very porous, and require constant brushing and sweeping to avoid taking root or spreading seeds. Ending3: [title] Use pyrex and pvc sawdust to protect areas of the boards and flooring. [substeps] Pvc is readily available at most hardware stores, and it helps to de-mold larger slab of wood. Ending4: [title] Drip-mark your cedar shingles. [substeps] Rainstorms give the shingles plenty of oxygen to properly rejuvenate their outer structure, making them mint green and free of mold and mildew.

Answer format: ending1/ending2/ending3/ending4