Keystone Acquisition Corp. S-1/A

REGISTRATION STATEMENT

FORM OF UNDERWRITING AGREEMENT

FORM OF AMENDED AND RESTATED MEMORANDUM AND ARTICLES OF ASSOCIATION

FORM OF WARRANT AGREEMENT BETWEEN EFFICIENCY AND THE REGISTRANT

FORM OF LETTER AGREEMENT AMONG THE REGISTRANT, KEYSTONE INTERNATIONAL ACQUISITION MANAGEMENT LLC AND EACH OF THE OFFICERS AND DIRECTORS OF THE REGISTRANT

FORM OF INVESTMENT MANAGEMENT TRUST AGREEMENT BETWEEN EFFICIENCY AND THE REGISTRANT

FORM OF REGISTRATION RIGHTS AGREEMENT AMONG THE REGISTRANT, KEYSTONE INTERNATIONAL ACQUISITION MANAGEMENT LLC AND THE HOLDERS SIGNATORY THERETO

FORM OF PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT BETWEEN THE REGISTRANT AND KEYSTONE INTERNATIONAL ACQUISITION MANAGEMENT LLC

FORM OF PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT BETWEEN THE REGISTRANT AND THE UNDERWRITERS

CONSENT OF WITHUMSMITH+BROWN, PC

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