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If by "four chemicals" you mean nucleotides, then they are as follows:

1. deoxyadenosine monophosphate or adenine

2. deoxyguanosine monophosphate or guanine

3. deoxycytosine monophosphate or cytidine

4. deoxythymine monophosphate or thymidine

The chemical bonds holding DNA molecules together are

1. phosphodiester bond in the polynucleotide strand

2. hydrogen bond between the complementary nitrogenous bases on adjacent polynucleotide strands.

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