Assertion: box spring's foundation | /r/CapableOf | come in twin
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Source sentences:
text: All box springs and their accompanying foundations come in twin (38 inches by 75 inches) twin XL (38 inches by 80 inches), full (54 inches by 75 inches), queen (60 inches by 80 inches), king (76 inches by 80 inches), and California king sizes (72 inches by 84 inches).