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I. INTRODUCTION

II. CLUSTER SURVEYS
A. The Planck Catalog
B. SPT and SPTpol
C. ACTpol

III. THEORETICAL MODELING
A. f(R) gravity

IV. FISHER MATRIX FORMALISM
A. Cosmological parameters

V. RESULTS
A. Number counts
B. Power spectrum
C. Combined constraints
D. Uncertainties in scatter of mass observable relations

VI. DISCUSSION

VII. CONCLUSIONS
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