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Here are some examples:

Edit 3: Clarifying that the message schedules from the original message and the new message are not the same

Here are some examples:

Edit 2: Got runtime per free start collision to 15-30 seconds

Edit 2: Got runtime per free start collision to 10-20 seconds

Here are some examples:

Original Message: c6b933ebc3fc6c20efca... (Last 20 Characters Redacted)
SHA-256 Hash w/ Free Start IV: dd962f2b94954efd9bf7123d604f77964cbba3c33ebce23f5427e2bd68746b90
SHA-256 Hash w/ Default IV:    dd962f2b94954efd9bf7123d604f77964cbba3c33ebce23f5427e2bd68746b90
Free-Start IV: ['a0c713d2', 'f72d07f2', 'cae8d227', '7517016b', 'fbe4026f', 0, 0, 0] ...(Last Three Values Redacted)
Default IV:    ['6a09e667', 'bb67ae85', '3c6ef372', 'a54ff53a', '510e527f', '9b05688c', '1f83d9ab', '5be0cd19']
===========================================================================================
Processing Time: 15.410990953445435 seconds...


Original Message: c7bd47c2b2ac163413bf... (Last 20 Characters Redacted)
SHA-256 Hash w/ Free Start IV: 28fae8901514959ba91483edf61c6b68f048ba70c9c5a4f363902d203d9a5267
SHA-256 Hash w/ Default IV:    28fae8901514959ba91483edf61c6b68f048ba70c9c5a4f363902d203d9a5267
Free-Start IV: ['d04e04a6', 'a491e269', 'c9a91311', '3a6e8a91', '4ff36d8e', 0, 0, 0] ...(Last Three Values Redacted)
Default IV:    ['6a09e667', 'bb67ae85', '3c6ef372', 'a54ff53a', '510e527f', '9b05688c', '1f83d9ab', '5be0cd19']
===========================================================================================
Processing Time: 10.901056051254272 seconds...


Original Message: 6c581fe6ec7eea7cfe67... (Last 20 Characters Redacted)
SHA-256 Hash w/ Free Start IV: a3eb9a1ae2e36a2ca916641056c282ccd3591a6ccabc130da4d18f76d7b18bd9
SHA-256 Hash w/ Default IV:    a3eb9a1ae2e36a2ca916641056c282ccd3591a6ccabc130da4d18f76d7b18bd9
Free-Start IV: ['6151dac5', 'ae19c43d', '6d0ba457', '33b5ed7f', '81e3520', 0, 0, 0] ...(Last Three Values Redacted)
Default IV:    ['6a09e667', 'bb67ae85', '3c6ef372', 'a54ff53a', '510e527f', '9b05688c', '1f83d9ab', '5be0cd19']
===========================================================================================
Processing Time: 6.203358173370361 seconds...


Original Message: db6bd2b96d000a5d4727... (Last 20 Characters Redacted)
SHA-256 Hash w/ Free Start IV: ad1aad4b2a5ba77759ef3b636a0c79a5c9eb8c5b1ca34553412c3163d6abee52
SHA-256 Hash w/ Default IV:    ad1aad4b2a5ba77759ef3b636a0c79a5c9eb8c5b1ca34553412c3163d6abee52
Free-Start IV: ['dd0bdfbd', 'b509a2e5', 'd2bec68c', '89edbd89', '4f19c561', 0, 0, 0] ...(Last Three Values Redacted)
Default IV:    ['6a09e667', 'bb67ae85', '3c6ef372', 'a54ff53a', '510e527f', '9b05688c', '1f83d9ab', '5be0cd19']
===========================================================================================
Processing Time: 19.402303457260132 seconds...