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In total, there are:
- 7 students with 2 siblings: 7*2 = 14 siblings
- 4 students with 1 sibling: 4*1 = 4 siblings
- 3 students with 0 siblings: 3*0 = 0 siblings
- 3 students with 3 siblings: 3*3 = 9 siblings
- The rest of the students each have 4 siblings: (25-7-4-3-3)*4 = 8 students with 4 siblings, totaling 8*4 = 32 siblings
Therefore, the total number of siblings in the class is:
14 + 4 + 0 + 9 + 32 = 59 siblings.